alleryIn a right triangle one acute angle is 35°. What is the other acute angle?
A35°
B145°
C45°
D55°
Answer & Solution
Correct answer: D. 55°
1. The right angle takes 90° of the 180° total.
2. The two acute angles share the remaining 90°, so they are complementary.
3. 90° - 35° = 55°; 145° is the supplement and does not fit inside a triangle.
_Source: Wikipedia, Angle, Combining angle pairs_
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