SA and V review before test Question: 3

Question

A company is designing a new cylindrical water bottle. The volume of the bottle will be 142 cm3. The height of the water bottle is 7.9 cm. What is the radius of the water​ bottle? Use 3.14 for π.

The radius of the water bottle is about __________ cm

​(Round to the nearest tenth as​ needed.)

Answer 1

volume = V = hpi(r^2)

142 = 7.9(3.14)r^2

r^2 = 142/7.9(3.14)

radius = r = sqr(142/(7.9)(3.14))

r = about sqr(5.72) = about 2.3926

radius = about 2.4 cm