Thread: Geometry angles

The measure of an angle is 3 times the measure of its supplement. Find the measure of the angle.

Let be the supplement of the angle that we are looking at (which we'll call ).

So, by definition, we know that: (1)

We also know that the angle is 3 times more than its supplementary angle, i.e.:

So substitute into (1) and we get:

Now just solve for the angle

Thank you so much! I've never taken Geometry and my daughter has a test tomorrow. You helped a lot!