00:01
In question 7, we're given that an average roll of wrapping paper has 27 square feet.
00:09
That's the area, 27 square feet.
00:16
And you're told that we have six gifts to wrap in various sized boxes and three boxes are 9 inches by 18 inches by 2 inches.
00:28
Three other gifts are going to, going in the boxes are that are cubes, measuring 6.
00:35
All right.
00:36
So we just highlight.
00:39
So we have three boxes with that dimension.
00:41
We have three boxes with the dimension six inches.
00:46
And so we'll be finding out how many rolls of wrapping paper are needed.
00:52
So this is a question on the surface area.
00:55
So you want to get the surface area of the boxes and then add them up.
01:02
Okay, so let's look at the first box.
01:06
So the the first box is 9 by 8, by 18, sorry, 9 by 18 by 2.
01:19
So the surface area, the lateral surface area, say the lateral surface area is equal to the perimeter of the base, right, let's take this to be the base.
01:31
So the perimeter of the base which is 9 plus 2 squared, ah sorry, 9 plus 9 plus 2, that's 9 plus 2, 11 times 2, 22.
01:45
So it's 22 times 18.
01:48
And the base, the area of the base, and the base area, is simply 9 times 2 times 2 because there are two sides.
01:58
All right, so what is this? 22 times 18 equals 396 and 9 times 2 times 2 is 36.
02:09
So in total we have 396 plus 36, which equals 4336.
02:18
And since there are three, i'm going to say three times 432, which equals 1 ,296 square feet.
02:32
Next, we have three cubes and each has a dimension of six inches.
02:41
So it's six by six.
02:43
How many faces do we have? one, two at the other side.
02:48
Three, four, five, six.
02:49
So it's six times six times six...