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Update index.html
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index.html

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@@ -1868,6 +1868,40 @@ <h6 style="font-size:160%;margin:7px;">Area of a regular polygon</h6>
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<msup>
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<mrow>
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<mo>(</mo>
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<mfrac>
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<mi>side</mi>
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<mn>2</mn>
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</mfrac>
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<mo>)</mo>
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</mrow>
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<mn>2</mn>
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</msup>
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</mrow>
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</math>
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<br>
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<br>
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<math style="margin:12px;" xmlns="http://www.w3.org/1998/Math/MathML" >
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<mrow>
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<mi>r</mi>
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<mo>=</mo>
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<msqrt>
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<mo>(</mo>
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<mfrac>
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<mi>side</mi>
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<mo>)</mo>
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<mn>2</mn>
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<mo>+</mo>
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<mrow>
@@ -1883,13 +1917,32 @@ <h6 style="font-size:160%;margin:7px;">Area of a regular polygon</h6>
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</math>
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<math style="margin:12px;" xmlns="http://www.w3.org/1998/Math/MathML" >
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</msqrt>
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<mn>5</mn>
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<mo>×</mo>
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<mrow>
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<mo>(</mo>
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<mfrac>
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<mi>side</mi>
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<mn>4</mn>
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</mfrac>
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<mo>)</mo>
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</mrow>
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<mn>2</mn>
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<mo>)</mo>
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</msqrt>
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<mo>=</mo>
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<mrow>
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<msqrt>
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<mn>5</mn>
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</msqrt>

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