alleryStart learning →One angle of a right triangle measures 28 degrees. What is the measure of the third angle?
A152
B90
C62
D118
Answer & Solution
Correct answer: C. 62
1. A right triangle already has one angle fixed at 90 degrees.
2. The three angles must add to 180 degrees, so 90 plus 28 plus x equals 180.
3. Combine the known angles: 118 plus x equals 180.
4. Subtract 118 from both sides: x equals 62.
_Source: OpenStax Prealgebra (CC BY 4.0), Ch 9 "Math Models and Geometry", section 9.3 Use Properties of Angles, Triangles, and the Pythagorean Theorem_
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