document.write( "Question 1056455: Find the measure of each interior angle of a regular 21-gon. \n" ); document.write( "
Algebra.Com's Answer #671562 by Alan3354(69443)\"\" \"About 
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Find the measure of each interior angle of a regular 21-gon.
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\n" ); document.write( "Step 1, exterior angles = 360/21
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\n" ); document.write( "The sum of exterior angles of all polygons is 360 degs
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\n" ); document.write( "Step 2, interior angles = 180 - exterior angle.
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