In triangle ABC, sides AB and BC are equal. What is the angle adjacent to angle C, if it is known that the angle adjacent to angle A is 121?
Since AB and BC are equal in a triangle, angles A and C are also equal (property of an isosceles triangle).
The angle adjacent to the angle A is equal to 180 ° – ∠A.
The angle adjacent to the angle С is equal to 180 ° – ∠С.
Since the angles A and C are equal, then the angles adjacent to them are equal. Means,
∠С = 121 °.
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