document.write( "Question 139148: a round target has 3 circles with radii of 2cm, 10cm, & 20cm. what is the probability that a dart randomly thrown hits the target within the outer ring? (outer ring's radii is 20cm) \n" ); document.write( "

Algebra.Com's Answer #101520 by checkley77(12844) $\"\"$ $\"About$

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A(20)=pir^2
\n" ); document.write( "A=3.14*20^2
\n" ); document.write( "A=3.14*400
\n" ); document.write( "A=1,256 total area
\n" ); document.write( "A(10)=3.14*10^2
\n" ); document.write( "A=3.14*100
\n" ); document.write( "A=314 area inside the 10 circle.
\n" ); document.write( "(1,256-314)/1,256=942/1,256=.75 or 75% chance of hitting the 20 ring. \n" ); document.write( "

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