Question

What is the surface area of the figure? Use 3.14 for π.

847.8 cm 2

2,402.1 cm 2

3,108.6 cm 2

12,717 cm 2

Answer 1

Answer 847.8cm2 because first you have to multiply 18 by 15 to get 270 then multiply 270 by 3.14 to get 847.8cm2

Answer 2

Option 3

Explanation:

We want to work out the surface-area

This is a cylinder and the formula for the surface area of a cylinder is :

2πrh+2πr^2

^ means to the power of

The radius is 15

The length is 18

2(3.14)(15)(18) + 2(3.14){15}^2

Part 1:

(6.28)(15)(18)

(6.28)(270)

1695.6

Part 2:

First, we do the exponents,

15^2 = 225

(6.28)(225)

1413

Part 3:

1695.6 + 1413 = 3108.6

Answer: 3108.6

Hope this helps :)