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Question

In triangle ABC, AB = AC and angle B = 40o . What is the value of ∠C?

A
∠C = 90o
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B
∠C = 70o
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C
∠C = 40o
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D
∠C = 80o
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Solution

The correct option is C ∠C = 40o
Since AB=AC, the angles opposite to these sides will also be equal (using the properties of isosceles triangle).
Hence, ∠B = ∠C
∠C = 40o

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