Explanation

A right triangle has one angle measuring 90 degrees. The sum of all angles in any triangle is 180 degrees. Hence,

The sum of all angles = angle 1 + angle 2 + angle 3

80 degrees = 90 degrees + 20 degrees + angle 3

180 – 90 – 20 = angle 3

Angle 3 = 70 degrees

Therefore, aside from the 20-degree angle, the triangle will have angles of:

90 degrees and 70 degrees

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