The value of one of the angles of an isosceles triangle is equal to 120 ° find the values of the other angles of the triangle.

The sum of the angles in any triangle is 180 °. If the angle at the base is 120 °, and the angles at the base are equal, the sum will already be 240 °, and such a triangle does not exist. So this is the angle at the top. To find out the remaining two angles in total, you need:

180 – 120 = 60 °

But 60 ° is two angles in total. By the theorem about the angles at the base, they are equal, therefore:

60/2 = 30 °. This will be the unknown angle and our answer.

Answer: 30 °