00:01
Okay, so i see that you need help with these questions and it wants you to first find the volume in the surface area of this shape.
00:09
So to find the surface area of this first shape, you need to use the formula of pi times the radius squared plus pi times the radius times the slant.
00:22
To find the slant height, what you need to do is you need to, if the height is four, then the radius here, if the diameter is 3 .5, you're going to take 3 .5 and divide that by 2.
00:39
So 3 .5 divided by 2 is 1 .75.
00:46
And so then 1 .75 squared plus 4 squared.
00:57
So 1 .75 squared is 3 .0625 plus 16.
01:04
16 plus 3 .0625.
01:11
And that's 19 .0625 and the square root of 19 .0625 and that is 4 .366.
01:26
And so you're going to do 3 .14 times the radius of 1 .75 times 4 .366 plus 3 .14 times the radius of 1 .75 squared.
01:46
So 3 .14 plus 1 .75 times 1 .75, not 3 .4, it's 3 .14 times 1 .75 times 1 .75.
01:58
And so that's 9 .61625 plus 3 .14 times 1 .75 times 4 .366.
02:14
That is 23 .9117 plus 9 .61625.
02:27
And so that is going to be a surface area of 33 .60742.
02:37
So that's 33 .60742 inches squared...