Question

Area of a cylinder..

Answer 1

Area of a lateral cylinder = \[2 \pi rh\]

Answer 2

What is the formula of lateral area for right cylinder?

Answer 3

@Emah Can you plug numbers in?

Answer 4

Uhh yeah I can!!! Thanks, but I already tried that.

Answer 5

So what's your result?

Answer 6

2pi(12*15)
2pi(180)

Answer 7

Remember that r refers to the radius. in this case 15 is the diameter.

Answer 8

Pay attention here 2R = D = 15

Answer 9

Ok then I plug in 7.5, correct?

Answer 10

Yep :)

Answer 11

But that still isn't a choice.

Answer 12

In this case, they expect you to take 2pi(1.5*12) or 2pi(90) and simplify by multiplying the 2 and the 90.

Answer 13

Oh ok, so without actually multiplying by pi.

Answer 14

yeah. They're allowing you to include the symbol pi in the answer.

Answer 15

Lateral Area = perimeter * height
A = 2R π * h
= 15 π * 12 = ...

Answer 16

K thanks dude! I got it now.

Answer 17

:)