### Think & Click:** Angle Bisectors**

Now, you try. Complete the Think & Click activity by looking at the problem below, thinking about it, and then clicking on the question to reveal the solution.

MC is the bisector of AMB. Using the information given below, find x.

Since MC is the bisector of AMB, then . Replacing the measures in this equation, we obtain

x + 20 = 3x - 40

Add 40 to each side, and simplify.

x + 20 + 40 = 3x - 40 + 40

x + 60 = 3x

Subtract x from each side, and simplify.

x + 60 - x = 3x - x

60 = 2xx = 30

**View this tutorial on angle addition:**