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Find the missing angle measure in ΔQRS. Q = ____°, R = 60°, S = 20° A. 80 B. 100 C. 120 D. 60
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2 votes
Find the missing angle measure in ΔQRS.

Q = ____°, R = 60°, S = 20°
A. 80
B. 100
C. 120
D. 60

User Magallanes
by
8.1k points

2 Answers

2 votes
A triangle always has 180 degrees.
180 = x + 60 + 20
180 = x + 80
100 = x
So our answer is B.
User Nayan Dabhi
by
7.9k points
5 votes
The answer would be B because all 3 angles on a triangle must add up to 180 degrees. Since the two angles you do know add up to 80, you need the last angle to be 100 degrees.
User Evy
by
8.2k points
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