Question

Find the missing angle measure in ΔQRS.
Q = ___°, R = 61°, S = 29°
A. 90
B. 80
C. 100
D. 180

Answer 1

Sum of all the angles in a triangle is 180°.
Therefore in ΔQRS,
R + S +Q = 180°
61° + 29° + Q = 180°
Q = 180 - 61 -29
Q = 90°
Hence option A is correct.
Hope this helps, have a nice day!