document.write( "Question 726484: You have two circles with circumference pi and 4pi. What is the ratio of the areas of the circles? What is the ratio of the diameters? What is the ratio of the radii?
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Algebra.Com's Answer #444607 by fcabanski(1391) $\"\"$ $\"About$

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C = d*pi where d is the diameter. The diameter of the first circle is 1, and its radius is .5 (1/2 the diameter. The diameter of the second circle is 4, and its radius is 2.

\n" ); document.write( "The ratio of the diameters is 1/4 (1:4)

\n" ); document.write( "Area is $\"pi%2Ar%5E2\"$ . For the first circle it's $\"pi%2A.5%5E2\"$ = .25*pi. For second circle it's $\"pi%2A2%5E2\"$ = 4*pi. The ratio is .25*pi/4*pi = .25/4 = 1/16.

\n" ); document.write( "The ratio of the radii is .5/2 = 1/4.
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