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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