math
posted by Thomas .
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

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 ? 
d. 6 1/4 pi cm^2

correct

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.)

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.)
Respond to this Question
Similar Questions

8th grade math
The radius of circle M is 3 times the radius of circle P. If the area of circle P is abotu 27 sq. cm. the area of circle M is about what? 
8th grade math
circle A has a raduis that is twice the length og the raduis of circle B. Which is an accurate statement about the relationship of these areas of circle A and B and y? 
MATH HELP PLEASE
You are given two different circles. The diameter of the first circle is the radius of the second circle. What is the ratio of the area of the larger circle to the area of the smaller circle. Your answer should be in the form of a … 
Updated Math Question
The radius of circle A is 9 times greater than the radius of circle B. Which of the following statements is true? 
math
I am supposed to find the area of a segment of a circle. The circle is cut with two radi with an angle of 90 degrees. Then where the radi touch the circle another line is drawn to connect them. The triangle and the small section between … 
math
The number of square units in the area of circle P is equal to the number of units in the circumference of circle P. Assuming that the diameter of the circle must be greater than P, what is the radius of circle P ? 
summer math hw
one circle has a diameter of 10 inches. a second circle has a diameter that is twice the diameter of the first circle What is the ratio of the area of the smaller circle to the larger circle 
Maths
1. In the xycoordinate plane, point A is the midpoint of the segment with endpoints (2,4) and (4,4). What is the distance from point A to the origin? 
math
The area of a circle is given by the formula A = ðr2, where r is the radius. If increasing the radius of a circle by 1 inch gives the resulting circle an area of 100ð square inches, what is the radius of the original circle? 
Math
The radius of the larger circle is 9cm. The diameter of the smaller circle is 11cm. Find the area of the shaded region The shaded area is between the larger circle and smaller circle . It is concentric The area of the larger circle …