Find the unknown angle of a triangle if its two angles are 121 degrees and 32 degrees.

The condition says that we are given a triangle and the degree measure of its two angles is known.

So, it is known that one of the angles is 121 °, and the second angle is 32 °.

To find the degree measure of the third angle, we apply the theorem on the sum of the angles of a triangle. Let’s remember how the theorem sounds.

It says that the sum of the angles of a triangle is 180 °.

That is, we can write the sum of the angles like this:

angle A + angle B + angle C = 180 ° if we are given a triangle ABC.

third angle = 180 ° – (121 ° + 32 °) = 180 ° – 153 ° = 27 °.