Ellis is measuring the angles of a triangle. She measures the first two gets 30 and 100. What should be the measure of the third angle?

The angles of a triangle always adds up to 180 degrees.

Hence, if you have the measures of 2 angles of a triangle, you can find the measure of the third angle by deducting the measures of the first 2 angles from 180 degrees.

30+100 = 130

The sum of the measures of the first 2 angles of the triangle is 130 degrees.

180-130 = 50

Ans: The measure of the third angle is 50 degrees.