In triangle ABC, sides AB and AC are equal, and ∠BAC = 70 °. Find ∠ABC.

univerkov | December 16, 2020 | education

If triangle ABC has two sides equal, then it is isosceles. Knowing that in an isosceles triangle the angles at the base are equal, we compose and solve the equation.
x + x + 70 = 180
2x = 110
x = 55.
We get that the angle ABC and the angle BCA are 55 °.

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