Question

PLS HELP! I NEED TO FIND THE SURFACE AREA OF THIS CYLINDER!

Answer 1

Answer:

1187.52

Step-by-step explanation:

Use the formula $2\pi rh+2\pi r^{2}$.

r= 7 (half of your diameter, which is 14)

h = 20

Fill in your radius and height.

$2\pi (7)(20)+2\pi (7^{2})$

Enter your equation into a calculator and you'll get 1187.52202.

When rounded to the nearest hundredths, you get 1187.52

Answer 2

Exact Surface Area = 378pi

Approximate Surface Area = 1186.92

The approximate surface area uses pi = 3.14

The units are cm^2 or "square cm".

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Work Shown:

SA = surface area of cylinder

SA = 2*pi*r^2 + 2*pi*r*h

SA = 2*pi*7^2 + 2*pi*7*20

SA = 2*pi*49 + 2*pi*140

SA = 2*49*pi + 2*140*pi

SA = 98pi + 280pi

SA = 378pi ..... exact surface area

SA = 378*3.14

SA = 1186.92 ..... approximate surface area

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Side note: The diameter 14 cuts in half to get the radius r = 7