00:00:03.220
In this lesson, we will learn about comp. angles.

00:00:08.110
Let's take a look at these two angles.

00:00:12.130
Notice that, when we add these two angles, we get 90 degrees.

00:00:18.200
Seeing this, we can say that these two angles are comp. angles.

00:00:24.210
Now, when we rotate this arm, these two angles must add to 90 degrees, to remain as comp. angles.

00:00:39.070
Adding 15 degrees with 75 degrees, gives 90 degrees.

00:00:51.020
Adding 67 degrees with 23 degrees, gives 90 degrees.

00:00:58.030
Now, let's see some examples.

00:01:02.140
Are these comp. angles?

00:01:06.030
To find out, we just need to add 12 degrees with 78 degrees. This gives 90 degrees.

00:01:15.220
Hence, these are angles that are complementary.

00:01:21.110
Next example, these two angles are comp. angles. Find x.

00:01:28.240
We know that, when we add these 2 angles, we must get 90 degrees.

00:01:36.240
Hence, we can find 'x', by subtracting 90 degrees, with 73 degrees.

00:01:44.210
Therefore, ‘x’ will be equals to 17 degrees.

00:01:50.190
That is all for this lesson.