Question

A cylinder has a height of 14 centimeters and its circle bases have a radius of 10 centimeters. Find the surface area of the cylinder.

Answer 1

Do you know the formula for the surface area of a cylinder?

Answer 2

no

Answer 3

http://www.math.com/tables/geometry/surfareas.htm

Answer 4

The only two values you need are r and h. "r" is your radius of 10 cm and "h" is your height of 14 cm. Plug and chug.

Answer 5

dk how

Answer 6

I gave you the website that lists surface areas for all kinds of shapes. Find where it says "surface area of a cylinder" and the formula's right there.

Answer 7

ok

Answer 8

If you get stuck just post what you have and we'll help.

Answer 9

So did you find the formula?

Answer 10

2 pi r 2 + 2 pi r h

Answer 11

Ok, and you know your r and h, right? And "pi" is just 3.14, right? Or if you have a scientific calculator it should just have the "pi" button on there. So plug in r=10 for the r in that formula and plug in h=14 for the h and multiply it all out. (2 times pi times r times 2) + (2 times pi times r times h). Do you have trouble multiplying?

Answer 12

no but im soo confused

Answer 13

Do you not have any previous experience plugging in numbers into a formula? Ok here it is: \[2*\pi*r ^{2} + 2*\pi*r*h\]\[2*\pi*10^{2}+2*\pi*10*14\]\[(2*3.14*100) +(2*3.14*140)\]

Answer 14

Do you have a calculator handy? If so, do the first parentheses first: 2 times 3.14 times 100 is equal to 628. The second parentheses is 2 times 3.14 times 140 which is equal to 879.2 so add those two parentheses together: 628 + 879.2 = ?

Answer 15

i have no cal

Answer 16

Ok well I did the calculator part for you anyway. The final result is in my last sentence -- you can add those two numbers just by writing them out. What do you get when you add 628 and 879.2? That's the surface area of your cylinder.

Answer 17

1507.2

Answer 18

Yep. Good job.

Answer 19

thx