00:01
In this world, all things are square or rectangular.
00:05
We're looking at two species of plant.
00:09
We have plant one, and we have plant two.
00:16
Plant one has leaves that are 1 by 5 by 8.
00:19
What is the volume and the surface area of these leaves? so the volume is just multiplying all three dimensions.
00:27
So that would be 40 centimeters cubed.
00:31
We'll do the same for plant 2.
00:32
That would be 42 centimeters cubes.
00:36
Surface area.
00:38
So for the surface area, we're going to have to add up the area of the six surfaces.
00:49
So if we have a look at these cuboid leaves, there are three types of surface.
01:00
Each is repeated twice.
01:01
We have this largest surface, which will have eight by five, and then 1 by 5 and 8 by 1.
01:13
So we have, for this plant 1, we have 2 times 5 times 8, plus 2 times 1, plus 2 times 8 by 1.
01:29
And that will give us the total surface area.
01:32
So that is going to be 80 plus 10, so that's 906.
01:41
Centimeters cubed.
01:42
That's centimeter squared.
01:44
So that's 40 times 2...