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ABC is a right angled triangle in which ∠A = 90º and AB = AC. Find ∠B and ∠C.
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Solution
It is given that
AB = AC
⇒ ∠C = ∠B (Angles opposite to equal sides are also equal)
In ΔABC,
∠A + ∠B + ∠C = 180º (Angle sum property of a triangle)
⇒ 90º + ∠B + ∠C = 180º
⇒ 90º + ∠B + ∠B = 180º
⇒ 2 ∠B = 90º
⇒ ∠B = 45º
∴ ∠B = ∠C = 45º
Concept: Properties of a Triangle
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