Posted by Thomas on Sunday, January 5, 2014 at 10:42pm.
A circle has an area of 25 pi cm^2.If a circle is drawn within that circle with a diameter equal to the radius of the first circle, what is the area of the second circle?
a. 2 1/2 pi cm^2
b. 4 1/4 pi cm^2
c. 5 1/4 pi cm^2
d. 6 1/4 pi cm^2
e. 7 1/2 pi cm^2
please answer and explain

math  Reiny, Sunday, January 5, 2014 at 10:53pm
Since the radius of the new circle is 1/2 of the original, and the radius is squared in the area formula, the new area must be 1/4 of the original
so what is (1/4) of 25 ?

math  Thomas, Sunday, January 5, 2014 at 10:56pm
d. 6 1/4 pi cm^2

math  Reiny, Sunday, January 5, 2014 at 11:03pm
correct

math  ricardo, Wednesday, March 5, 2014 at 3:39pm
The diameter of a circle is 10 meters. What is the area of the circle? (Use 3.14 for mc0041.jpg and round to the nearest tenth.)

math  darrius, Friday, February 20, 2015 at 9:19am
The diameter of a circle is 10 meters. What is the area of the circle? (Use 3.14 for mc0041.jpg and round to the nearest tenth.)
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