Geometry and TrigonometryEasySplitting a right angle
Geometry and Trigonometry practice question
A ray drawn from the vertex of a right angle divides it into two angles. One of the two angles measures 28°. What is the measure, in degrees, of the other angle?
Answer: 62
A right angle measures 90°. The two parts add to 90: 90 − 28 = 62.
Common wrong answers
- If you answered 28
- The two parts of a right angle are equal only if each is 45°. Here one is 28°, so the other is 62°.
- If you answered 118
- 118 is 90 + 28. The parts of the angle add to 90, so subtract.
- If you answered 152
- 152 is 180 − 28, treating the right angle as a straight angle. A right angle is 90°.
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