Answer:
86
Step-by-step explanation:
1. Find the third interior angle of the triangle.
All angles in a triangle have a sum of 180 degrees. So, to find the third angle add the first two measurements and subtract their sum from 180.
28 + 58 = 86
180 - 86 = 94.
2. The inner angle and the outer angle are supplementary, meaning their sum is 180.
Subtract the inner angle's measurement from 180 to get the answer.
180 - 94 = 86
