00:01
In this problem, we're asked to find the area of this composite figure.
00:06
It consists of the rectangle and two semicircles.
00:12
So i have written the formulas for area of a rectangle.
00:16
Area of a rectangle is length times width, and area of a circle is pi r square.
00:21
Because when we look at this figure, we have this semicircle and this semicircle.
00:27
They have the same diameter, so there actually halves of the size.
00:31
Same circle.
00:32
So we're just, instead of taking half of a circle finding that, half a circle finding that, we're just going to put those together and find the area of one circle using the formula of pi or square.
00:44
Our formula for circle has radius in it, but in the diagram, this eight actually represents the diameter.
00:54
So we know that the radius is half the diameter.
01:00
So let's do this.
01:03
Let's write that the radius equals 8 divided by 2, and we get 4...