document.write( "Question 1062744: A regular decagon is inscribed inside a circle. The perimeter of the decagon is 50 units.\r
\n" ); document.write( "\n" ); document.write( "A: What is the approximate measure of the radius (rounded to the nearest hundredth of a unit)?\r
\n" ); document.write( "\n" ); document.write( "B: What is the approximate area of the circle (rounded to the nearest whole square unit)?\r
\n" ); document.write( "\n" ); document.write( "Select only one answer each for parts A and B.\r
\n" ); document.write( "\n" ); document.write( " A: 8.09
\n" ); document.write( " A: 2.63
\n" ); document.write( " A: 7.69
\n" ); document.write( " A: 4.25
\n" ); document.write( " B: 22
\n" ); document.write( " B: 186
\n" ); document.write( " B: 206
\n" ); document.write( " B: 57
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Algebra.Com's Answer #677725 by josgarithmetic(39618)\"\" \"About 
You can put this solution on YOUR website!
The one decagon is composed of 10 isosceles triangles.\r
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\n" ); document.write( "\n" ); document.write( "Each base side of one isosceles triangle is \"50%2F10=5%2Aunits\".\r
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\n" ); document.write( "\n" ); document.write( "Each vertex angle of one isosceles triangle is \"360%2F10=36%2Adegrees\" and is a central angle of the circle.\r
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\n" ); document.write( "\n" ); document.write( "Each base angle of one such isosceles triangle is \"%28180-36%29%2F2=72%2Adegrees\".\r
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\n" ); document.write( "\n" ); document.write( "Can you now continue with that to answer your questions?
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