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PQR is an isosceles triangle with PQ = QR. If mQPR = 40°, what is mPQR?

User Jamin Grey
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2 Answers

3 votes

Answer:

E.

100°

Explanation:

User Gardarvalur
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One of the congruent angles of the isosceles triangle given above is 40° which means that the other angle, mPRQ is also 40°. Knowing that the sum of the angles of a triangle is 180°, mPQR may be calculated by,
mPQR = 180 - (mPRQ + mQPR)
Subsituting the given,
mPQR = 180 - (40 + 40) = 100°
Thus, the answer is 100°.
User DapperDuck
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