Find the third angle of the triangle using the given two angles of 30 degrees and 50 degrees.

From the condition we know that two angles of the triangle are given, 30 ° and 50 °. In order to find the third angle of a triangle, let’s recall the theorem on the sum of the angles of a triangle.

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

Let us denote by the variable x the unknown angle of the triangle.

Let’s compose and solve a linear equation with one variable.

30 + 50 + x = 180;

We transfer the terms without a variable to the right side of the equation:

x = 180 – 30 – 50;

x = 100 ° third corner of the triangle.