Question

What is the surface area of a right cylinder which has a base with radius 9 units and has a height of 12 units?

Answer 1

1187.997

Explanation:

surface area =2πrh+2πr^2

(2•22/7•9•12)+(2•22/7•9^2)

44/7(108)+44/7(81)

6.285(108)+6.285(81)

678.857+509.14

1187.997

Answer 2

1187.52

Explanation:

A=2πrh+2πr2=2·π·9·12+2·π·92≈1187.52202