In an isosceles triangle CDE, the angle is D = 130 degrees. What are the other angles of the triangle equal to?

1. The angles at the side that is the base of an isosceles triangle are the same in magnitude, that is, the angle C is equal to the angle E.

2. We calculate the value of these angles, based on the fact that the total value of all interior angles of the triangle is 180 °:

Angle C = Angle E = (180 ° – 130 °): 2 = 50 °: 2 = 25 °.

Answer: angle C is 25 °, angle E is 25 °.

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