Question

8. In AABC, mC = 90° and sin A =

What is m angle B in degrees?
A. 30°
B. 45°
C. 60°
D. There is not enough information to determine.

Answer 1

C

Explanation:

The degrees of a triangle add up to 180.

Angle C is already 90 degrees therefore angle A + angle B = 90 degrees.

Angle A is equal to sinA=1/2.

sinA=1/2 is equal to 30 degrees if you press 2nd, sin (1/2) into the calculator. You may also know this if you have memorized the values of trig.

90-30=60.

That leaves you with 60 degrees for angle B.