Question

in a △ABC, if AB=AC and ∠A=100°, the find ∠B and ∠C​

Answer 1

Since AB = AC

∠B = ∠C = x ( base angles of an isoceles △ )

∠A + ∠B + ∠C = 180°(∠ sum prop of a △ )

100° + x + x = 180°

2x =80°

x = 40°

∠B = ∠C = x = 40°

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