Question

triangleABC is an isosceles triangle with AB = AC. If angleB = 40°, what are the measures of angleA and angleC
Class 7​

Answer 1

Answer:

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Answer 2

Answer:

∠A = ∠C = 70°

Step-by-step explanation:

Since we know that △ABC is an isosceles triangle, we have:

∠A = ∠C

Let the unknown value be x

40° + x + x = 180° (Angle sum property of a triangle)

2x + 40° = 180°

2x = 180° - 40°

2x = 140°

x = 140°/2

x = 70°

Now, ∠A = ∠C = 70° because these two angles are equal.

Hope it helps you!