00:02
Calculate the volume, lateral area and surface area of the following cylinder.
00:08
So for this, in order to find the volume, you have to do pi times the radius squared times the height.
00:15
I don't know why i did a d.
00:17
Let me fix that.
00:23
So i'm going to do 3 .14 for pi times the radius of four times the height of seven.
00:30
So volume equals 3 .14 times 20.
00:35
Because 4 times 7 is 28 and then 28 times 3 .14 and the volume equals 87 .92 units cubed.
00:56
Then for the lateral area, well first of all to find the surface area, you're going to do 2 times pi times the radius squared plus 2 times pie times the radius times the height.
01:07
So for the lateral area, you're going to do two times pi times the radius times the height.
01:13
So two times pi times the radius times the height is two times three point one four times the radius of four times the height of 20, not 27.
01:27
So this should be seven, not a two...