JAMB - Mathematics (2009 - No. 27)

Find the radius of a sphere whose surface area is 154 cm\(^2\)?

7.00 cm

3.50 cm

3.00 cm

1.75 cm

154 = 4 x	22	x r\(^2\)
	7

154x7	r\(^2\)
4x22

√ 49/4 = r

7	= r
2

∴r = 3.50