Emmas math teacher a triangel that had a 60degree angle and a 20 degree angle. what is the measure of the third angle in the triangle

100 degrees

Step-by-step explanation:

The angles in a triangle must add to 180 degrees.

We know 2 of the angles, 60 and 20. We don't know the third, so we can call it x.

60, 20 and x added together must equal 180, or

60+20+x=180

Add 60 and 20

80+x=180

We are trying to find the third angle, or x. In order to do this, we have to get x by itself. 80 is being added onto x. To undo this, subtract 80 from both sides

80-80+x=180-80

x=100

So, the third angle is 100 degrees