00:01
So in this problem, we need to consider what area is, are we painting? and so we have a room that is a cube shape or a rectangular prism shape, i should say.
00:13
And it looks maybe something like this.
00:17
And we're not going to paint the ceiling or the floor.
00:19
We're going to just paint the walls.
00:21
And so we're looking at the walls or the sides.
00:24
We're looking for the lateral areas we're looking for.
00:26
We're not worried about the ceiling or the floor.
00:28
And so we want to find the lateral area.
00:30
Now, this happens to be a 20 -foot long room, a 15 -foot wide, and 8 feet tall.
00:41
So what we're going to do is we're going to find, for the lateral area, find the perimeter of a base and multiply by the heights.
00:47
Now, the perimeter down here is 15 by 20, and then we've got to do 15 over here and 20 in the backside, add them all up...