Question

4. Find the surface area of a cylinder with d = 6 cm: h = 8 cm.
A.
56.52 sq. cm
B.
207.24 sq. cm
C.
150.72 sq. cm
D.
28.26 sq. cm

Answer 1

Area is equal to Pi times the radius squared (Pi*r^2)
and after you have the area, (the area is like a lid to a cylinder) you times that by 2 (because there's one on top and on bottom) you will need to find the side

Answer 2

if you cut a straight line down the side, then the cylinder will just be a BIG rectangle! the area of a rectangle is Length times width

Answer 3

Length will be the Height of the Cylinder, and the width (what wraps around the top) will be the same as the circumference (or Pi * radius*2)

Answer 4

so it will be Height times Circumference PLUS Area of top times Area of bottom

Answer 5

OR Height times 2Pi*r PLUS 2Pi*r^2

Answer 6

You follow that @butterflyheart16 ? :)

Answer 7

Yeah

Answer 8

the radius is half of the diameter so the radius is 6/2 or 3cm

Answer 9

SO, 8cm*2*Pi*3cm+2*Pi*3cm^2

Answer 10

just put it in your calculator...

Answer 11

I am

Answer 12

Let me know what you get :)

Answer 13

i got 170.4392

Answer 14

I got 207.35..

Answer 15

sorry it's a little confusing with the centimeters in the middle of the equation

Answer 16

I left them there, because then you can see that your answer ends up being in units of cm^2 :)

Answer 17

Oh okay that makes sense :)

Answer 18

Can you help me with 1 more question

Answer 19

sure,

Answer 20

if it's quick

Answer 21

I've gotta head in 5 mins

Answer 22

I sent u a message