Help please!!!

The students in a drama club used a circular piece of wood with a 5-foot diameter to display the moon on stage. They painted half of the piece of wood white to represent a half moon, as shown below.

http://i.imgur.com/IkkJ2.gif

What is the approximate area of the section of the moon the students painted white? (Use pi = 3.14)

A.
7.85 ft2

B.
9.81 ft2

C.
15.70 ft2

D.
39.26 ft2

Question

Help please!!!

The students in a drama club used a circular piece of wood with a 5-foot diameter to display the moon on stage. They painted half of the piece of wood white to represent a half moon, as shown below.

http://i.imgur.com/IkkJ2.gif

What is the approximate area of the section of the moon the students painted white? (Use pi = 3.14)

	
A.
7.85 ft2
	
B.
9.81 ft2
	
C.
15.70 ft2
	
D.
39.26 ft2

apoorvk · Answer

B.... half of the area of the circle of dia 5 ft, that is radius 2.5 ft.

hoblos · Answer

area of moon = (pi)r^2 = (3.14)(2.5)^2
                     =19.625

area of white region = 19.625/2 = 9.8125

so B