document.write( "Question 1106935: A regular pentagon is inscribed inside a circle. The perimeter of the pentagon is 95 units.\r
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document.write( "A: What is the approximate measure of the radius of the circle?\r
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document.write( "B: What is the approximate area of the circle?\r
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document.write( "Choose only one answer each for parts A and B.\r
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document.write( " A: 11.74\r
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document.write( " A: 13.08\r
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document.write( " A: 7.69\r
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document.write( " A: 16.16\r
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document.write( " B: 433\r
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document.write( " B: 821\r
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document.write( " B: 537\r
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document.write( " B: 186
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Algebra.Com's Answer #721931 by Boreal(15235)![]() ![]() You can put this solution on YOUR website! If this is drawn,the radius is the hypotenuse of a right triangle with base 9.5 (half the side length of 19) and angle with hypotenuse of 54 degrees, half of the internal angle. cosine 54=9.5/x \n" ); document.write( "x=9.5/cos 54=16.16 \n" ); document.write( "========== \n" ); document.write( "The area is pi*(16.16)^2, which can be estimated as 250*3 1/4 or about 815. \n" ); document.write( "It is 820.65, so 821 is the correct answer. \n" ); document.write( " |