SAT考试几何部分常用公式
<p> <span word="Angles">Angles</span> <span word="Review">Review</span></p><p> <span word="Angle">Angle</span> <span word="CMB">CMB</span> = <span word="Angle">Angle</span> <span word="AMD">AMD</span></p><p> <span word="Angle">Angle</span> <span word="AMD">AMD</span> + <span word="Angle">Angle</span> <span word="CMA">CMA</span> = 180<span word="o">o</span></p><p> <span word="Example">Example</span> <span word="of">of</span> <span word="SAT">SAT</span> <span word="question">question</span> <span word="with">with</span> <span word="angles">angles</span>:<span word="In">In</span> <span word="the">the</span> <span word="figure">figure</span> <span word="below">below</span>, <span word="angle">angle</span> <span word="AMB">AMB</span> <span word="is">is</span> 100<span word="o">o</span>, <span word="angle">angle</span> <span word="BMD">BMD</span> <span word="is">is</span> 40<span word="o">o</span> <span word="and">and</span> <span word="angle">angle</span> <span word="CME">CME</span> <span word="is">is</span> 60<span word="o">o</span>. <span word="What">What</span> <span word="is">is</span> <span word="the">the</span> <span word="value">value</span> <span word="of">of</span> <span word="angle">angle</span> <span word="CMD">CMD</span>?</p><p> <span word="Figure">Figure</span> <span word="not">not</span> <span word="drawn">drawn</span> <span word="to">to</span> <span word="scale">scale</span></p><p> 20<span word="o">o</span></p><p> 30<span word="o">o</span></p><p> 40<span word="o">o</span></p><p> 50<span word="o">o</span></p><p> 80<span word="o">o</span></p><p> <span word="Answer">Answer</span>: <span word="If">If</span> <span word="angle">angle</span> <span word="AMB">AMB</span> <span word="is">is</span> 100<span word="o">o</span>, <span word="then">then</span> <span word="angle">angle</span> <span word="BME">BME</span> <span word="is">is</span> 180<span word="o">o</span> - 100<span word="o">o</span> = 80<span word="o">o</span></p><p> <span word="BMC">BMC</span> + <span word="CMD">CMD</span> = 40<span word="o">o</span></p><p> <span word="BMC">BMC</span> + <span word="CMD">CMD</span> + <span word="DME">DME</span> = 80<span word="o">o</span></p><p> <span word="If">If</span> <span word="we">we</span> <span word="subtract">subtract</span> <span word="the">the</span> 2 <span word="equations">equations</span>, <span word="DME">DME</span> = 40<span word="o">o</span></p><p> <span word="CMD">CMD</span> + <span word="DME">DME</span> = 60<span word="o">o</span></p><p> <span word="BMC">BMC</span> + <span word="CMD">CMD</span> + <span word="DME">DME</span> = 80<span word="o">o</span></p><p> <span word="If">If</span> <span word="we">we</span> <span word="subtract">subtract</span> <span word="the">the</span> 2 <span word="equations">equations</span>, <span word="BMC">BMC</span> = 20<span word="o">o</span></p><p> <span word="CMD">CMD</span> = <span word="BME">BME</span> - <span word="BMC">BMC</span> - <span word="DME">DME</span> = 80<span word="o">o</span> - 40<span word="o">o</span> - 20<span word="o">o</span> = 20<span word="o">o</span></p><p> <span word="Parallel">Parallel</span> <span word="Lines">Lines</span> <span word="Review">Review</span></p><p> <span word="If">If</span> <span word="the">the</span> 2 <span word="horizontal">horizontal</span> <span word="lines">lines</span> <span word="are">are</span> <span word="parallel">parallel</span>,</p><p> - <span word="angles">angles</span> 1 = 3 = 5 = 7 <span word="and">and</span></p><p> - <span word="angles">angles</span> 2 = 4 = 6 = 8</p><p> <span word="Polygons">Polygons</span> <span word="Review">Review</span></p><p> <span word="The">The</span> <span word="sum">sum</span> <span word="of">of</span> <span word="the">the</span> <span word="measures">measures</span> <span word="of">of</span> <span word="the">the</span> <span word="interior">interior</span> <span word="angles">angles</span> <span word="of">of</span> <span word="a">a</span> <span word="triangle">triangle</span> <span word="is">is</span> 180.</p><p> <span word="a">a</span> + <span word="b">b</span> + <span word="c">c</span> = 180<span word="o">o</span></p><p> <span word="The">The</span> <span word="sum">sum</span> <span word="of">of</span> <span word="the">the</span> <span word="measures">measures</span> <span word="of">of</span> <span word="the">the</span> <span word="interior">interior</span> <span word="angles">angles</span> <span word="of">of</span> <span word="a">a</span> <span word="polygon">polygon</span> <span word="is">is</span>:</p><p> 180<span word="o">o</span></p><p> <span word="n">n</span> = <span word="number">number</span> <span word="of">of</span> <span word="sides">sides</span> <span word="of">of</span> <span word="the">the</span> <span word="polygon">polygon</span>.</p>
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