If circles x and y have the same area and circle x has a circumference of 20π, half of the radius of circle y is:  Choose the correct choice from the following options:	A) 16	B) 5	C) 4	D) 2	E) 1
x bé radius of circle x   ý bé radius of circle y   given:   pi*x^2 = pi*ý^2   also,   2*pi*x = 20*pi   x =10   thus ý = 10   y/2 = 5   Ans: 5
<result>B</result>
If circles x and y have the same area and circle x has a circumference of 20π, half of the radius of circle y is: