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185 lines
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HTML
185 lines
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<title>US Standard Lengths</title>
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<h1 align="center">US Standard Lengths</h1>
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<p>Measuring how long things are, how tall they are, or how far apart they might be are all examples of length measurements. </p>
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<p align="center"><img src="images/inches-fork.jpg" width="480" height="104" alt="8 inches fork" /><br />
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Example: This fork is 8 inches long</p>
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<p>These are the most common measurements:</p>
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<div id="midul">
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<ul>
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<li><b>Inches</b></li>
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<li><b>Feet</b></li>
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<li><b>Yards</b></li>
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<li><b>Miles</b></li>
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</ul></div>
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<p> </p>
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<p><img src="images/fingers.jpg" alt="fingers" width="116" height="87" style="float:left; margin: 10px;" />
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</p>
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<p><span class="larger">Small units of length are called <b>inches</b>.</span> </p>
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<p>The last joint of your finger or thumb is about 1 inch (depending on how big your fingers are!).</p>
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<p>An inch is defined as exactly <b>2.54 centimeters</b> (a <a href="metric-length.html">metric measurement</a>)</p>
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<p>Lots of things are measured in inches from rainfall to paper length. </p>
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<p>Measuring in inches gives us a way for everyone to understand the size of something. </p>
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<p> </p>
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<p><img src="images/feet.jpg" alt="feet" width="133" height="133" style="float:left; margin: 10px;" />
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</p>
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<p><span class="larger">When we have 12 inches together, it is known as a <b>foot</b>.</span> </p>
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<p align="center" class="large">1 foot = 12 inches</p>
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<p>A long time ago, people used their feet to measure things. But everyone has different sized feet so it did not work very well. </p>
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<p>Using 12 inches put together to make one foot lets everyone have an accurate picture of what exactly a "foot" of length is.</p>
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<p> </p>
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<p><img src="images/guitar-length.jpg" alt="1 meter" width="259" height="172" style="float:right; margin: 10px;" />
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</p>
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<p class="larger">When 3 feet are together, it is called a <b>yard</b>. </p>
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<p>(This isn’t the same thing as a garden, though they are both referred to as a "yard"!) </p>
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<p align="center" class="large">1 yard = 3 feet</p>
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<p align="right">The length of this guitar is about 1 yard.</p>
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<p> </p>
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<p> </p><p><img src="images/roads.jpg" alt="roads" width="156" height="100" style="float:left; margin: 10px;" /></p>
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<p><span class="larger">When we put together 1,760 yards, we have a <b>mile</b>.</span></p>
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<p align="center" class="large">1 mile = 1,760 yards = 5,280 feet</p>
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<p>Miles are long distances and are mostly used to measure the distance between places which are far away from each other. Most people refer to miles when they are driving, biking or jogging.</p>
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<div class="center80">
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<p>To remember how many feet in a mile think:</p>
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<p class="center larger"><i>Five tomato<br />
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Five two eight oh<br />
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5,280 feet in a mile</i></p>
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</div>
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<p> </p>
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<p>Final thoughts about measuring length:</p>
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<p align="center" class="large">1 foot = 12 inches </p>
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<p align="center" class="large">1 yard = 3 feet = 36 inches</p>
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<p align="center" class="large">1 mile = 1,760 yards = 5,280 feet = 63,360 inches</p>
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<h2>From Miles to Kilometers</h2>
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<p>A mile is <b>exactly 1.609344</b> kilometers. Yes, the mile has a <a href="metric-length.html">metric</a> definition.</p>
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<div class="example">
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<h3>Example: what is 55 miles in kilometers?</h3>
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<p>55 miles × 1.609344 km/mile = <b>88.51392 km</b></p>
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</div>
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<div class="fun">
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<h3>Quick <i><b>but not accurate</b></i> Conversions</h3>
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<p>Here is a <b>funny thing</b>! These numbers can help us do conversions:</p>
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<p class="center"><b>0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, ...</b></p>
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<p>It is the <a href="../numbers/fibonacci-sequence.html">Fibonacci Sequence</a>, which is made by adding the two previous numbers each time. Example: 5+8=13, 8+13=21, etc.</p>
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<p class="larger center">Its <b>pairs of numbers</b> can help us <br>
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convert between miles and kilometers.</p>
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<p>The first few numbers don't work well, but let's look at "3, 5": </p>
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<p class="center"><b>3 Miles is About 5 km</b> (3×1.609344 = 4.828032)</p>
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<p>And "5, 8": <b>5 Miles is About 8 km</b> (5×1.609344 = 8.04672)</p>
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<p>And "8, 13": <b>8 Miles is About 13 km</b> (8×1.609344 = 12.874752)</p>
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<p>And so on.</p>
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<p><i>(Why? Because the ratio between pairs of numbers gets closer and closer to the <a href="../numbers/golden-ratio.html">Golden Ratio</a> of <b>1.6180...</b> which just happens to be <b>nearly 1.609344</b>)</i></p>
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</div>
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<p> </p>
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<h2>Lots of Examples</h2>
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<p>An inch is:</p>
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<ul>
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<li>about the width of a large thumb</li>
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<li><b>exactly</b> 2.54 centimeters (it has a <a href="metric-length.html">metric</a> definition)</li>
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</ul>
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<p>A foot is:</p>
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<ul>
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<li>about the length of a large foot</li>
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<li>slightly more than 30 centimeters</li>
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<li><b>exactly</b> 30.48 centimeters (it has a <a href="metric-length.html">metric</a> definition)</li>
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</ul>
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<p>A yard is about: </p>
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<ul>
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<li>half the length of a bed </li>
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<li>the width of a large fridge </li>
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<li>the height of a countertop </li>
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<li>four rungs up a ladder</li>
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<li>five steps up a staircase</li>
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<li>the length of a bike </li>
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<li>the depth of the shallow end of a swimming pool</li>
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<li>the width of a dining table</li>
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<li>the length of an acoustic guitar</li>
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<li>the height of a 5 year old</li>
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<li>shoulder to opposite wrist of an adult</li>
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<li>outstreched arms of a child</li>
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<li>waist high on an adult</li>
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<li>a long stride</li>
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<li><b>exactly</b> 0.9144 meters (it has a <a href="metric-length.html">metric</a> definition)</li>
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</ul>
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<p>A mile is about:</p>
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<ul>
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<li>how far you walk in 20 minutes</li>
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<li>2,000 paces</li>
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<li>1,000 counts of "left-right" when marching (as the Roman Centurions marched!)</li>
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<li><b>exactly</b> 1.609344 kilometers</li>
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</ul>
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<p> </p>
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<div class="questions">
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<script type="text/javascript">getQ(990, 991, 992, 993, 3616, 3617, 3618, 3619, 3620, 3621);</script>
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</div>
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<div class="activity"><a href="../activity/discover-lengths.html">Activity: Discover Lengths</a></div>
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<div class="related"><a href="us-standard-units-introduction.html">US Standard Units Introduction</a> <a href="index.html">Measurement Index</a> </div>
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Copyright © 2018 MathsIsFun.com
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