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In a △ABC, BC = AC and ∠B = 64°, find ∠C.

Triangles

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Answer

In a △ABC, BC = AC and ∠B = 64°, find ∠C. R.S. Aggarwal Mathematics Solutions ICSE Class 9.

In △ABC,

BC = AC

⇒ ∠B = ∠A = 64° [Angles opposite to equal sides are equal]

By angle sum property of a triangle,

⇒ ∠A + ∠B + ∠C = 180°

⇒ 64° + 64° + ∠C = 180°

⇒ 128° + ∠C = 180°

⇒ ∠C = 180° - 128°

⇒ ∠C = 52°.

Hence, ∠C = 52°.

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