Question

The volume of a cylinder is 289 cm3 and the height is 21 cm. Find the diameter. Round the answer to the nearest whole number.
A. 2 cm
B. 3 cm
C. 6 cm
D. 4 cm

Answer 1

im lost

Answer 2

Volume cylinder = 289 = pi * r(adius) * radius * height = pi * r * r * 21
Then 289 = 3.1415 * r * r * 21
Then 289 / 3.1415 = r * r * 21
Then 91.99 = r * r * 21
Then 91.99 / 21 = r * r
Then 4.38 = r * r
Then r = square root of 4.38
Then r ≃ 2.09
Then d = diameter = radius * 2 = 2.09 * 2 ≃ 4

Answer 3

thanx