document.write( "Question 979530: how do you find the perimeter of a shaded region of a circle \r
\n" ); document.write( "\n" ); document.write( "the shaded region is 140 degrees
\n" ); document.write( "the area of the shaded region is 126π
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Algebra.Com's Answer #600820 by josmiceli(19441)\"\" \"About 
You can put this solution on YOUR website!
If you can find the radius, then
\n" ); document.write( "the problem is solved, since
\n" ); document.write( "Circumference = \"+2%2Api%2Ar+\"
\n" ); document.write( "--------------------------
\n" ); document.write( "The whole circle is \"+360+\" degrees of arc
\n" ); document.write( "\"+140+%2F+360+=+7%2F18+\"
\n" ); document.write( "Let \"+A+\" = the area of the whole circle
\n" ); document.write( "I can say:
\n" ); document.write( "\"+%28+7%2F18+%29%2AA+=+126%2Api+\"
\n" ); document.write( "\"+A+=+%28+18%2F7+%29%2A126%2Api+\"
\n" ); document.write( "\"+A+=+324%2Api+\"
\n" ); document.write( "I know that:
\n" ); document.write( "\"+A+=+pi%2Ar%5E2+\" ,so
\n" ); document.write( "\"+pi%2Ar%5E2+=+324%2Api+\"
\n" ); document.write( "\"+r%5E2+=+324+\"
\n" ); document.write( "\"+r+=+18+\"
\n" ); document.write( "and
\n" ); document.write( "\"+C+=+2%2Api%2Ar+\"
\n" ); document.write( "\"+C+=+2%2Api%2A18+\"
\n" ); document.write( "\"+C+=+36%2Api+\"
\n" ); document.write( "-----------------
\n" ); document.write( "The perimeter of the shaded rgion is:
\n" ); document.write( "\"+%28+7%2F18+%29%2A36%2Api+\"
\n" ); document.write( "\"+14%2Api+\" answer
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