Question

Find the measure of

Answer 1

We can see that the angles of 39° and 90° in the figure are adjacent, that is, they have one side in common.

We can also see that the angle x includes both smaller angles. The angles x and 39° have one side in common, and the angles x and 90 have one side in common.

Then, we can conclude that the angle x is the sum of those 2 smaller angles in the figure.

So we have that:

`\begin{gathered} x=39\degree+90\degree \\ x=129\degree \end{gathered}`

So the measure of x is 129°.