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Question

In triangle ABC, if BC=AC and B=40. Then C is equal to

___ degrees.

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Solution

In a triangle, if two sides are equal then it is an isosceles triangle in which the angles opposite to the two equal sides are also equal.

Therefore, A=B

Since sum of all the angles in a triangle =180

A+B+C=180

2×40+C=180 (A=B)

C=1802×40

C=100


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