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The measure of the third angle in a right triangle with one interior angle measuring 51.1° is 34.9°.

By definition, all triangles have interior angles that add to 180°. Thusly:

Angle A + Angle B + Angle C = 180°

Also by definition, a right triangle has one angle that measures 90°. Therefore

90° + Angle B + Angle C = 180°

We know the measure of one of our angles, so...

90° + 55.1° + C = 180°

Combine the two known angles...

145.1° + C = 180°

Subtract 145.1° from both sides to solve for C

145.1° - 145.1° + C = 180° - 145.1°

C = 34.9°

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Q: What is the third angle of a right triangle if one of the angles measures 51.1?
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