Question

Find the third angle of a triangle if two of its angles are equal to:

25 degrees and 80 degrees

and

25 degrees and 120 degrees

Answer 1

60 degrees

Explanation:

Answer 2

75 degrees, 35 degrees

Explanation:

a. Adding 25 degrees and 80 degrees yields 105 degrees. The third angle of the given triangle must therefore be 180 degrees less 105 degrees, or 75 degrees.

b. Adding 25 degrees and 120 degrees yields 145 degrees. The third angle of the given triangle must therefore be 180 degrees less 145 degrees, or 35 degrees.