Question

A right circular cylinder has a base whose area is 616 square feet. If the height of the cylinder is 9 feet, what is its lateral surface area? use pi = 22/7.

1408 ft2

396 ft2

792 ft2

5544 ft2

Answer 1

I tried drawing it out and assumed 616 was the diameter, and I used 308 for the radius in the formula for the lateral area of a cylinder, but I got 17416 as an asnwer :/

Answer 2

Lateral surface area = 2 * pi * r * h

= 2 * 22/7 * r * 9 -----> 1

2. Area at base = pi * r2 = 22/7 * r2 = 616
so r = 14 ft.... substitute in 1..

So Lateral area = 2 * 22/7 * 14 * 9 = 792 sq ft...

option 3...