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Question

The sum of two angles of a triangle is equal to its third angle . Determine he measure of the third angle .

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Solution

In ΔABC,

Given that A+C=B

But A+B+C=180 (Sum of angles of a triangle)
B+A+C=180
B+B=180 [Since, A+C=B]
2B=180
B=1802=90
Third angle =90


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