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125 degrees
When we see the word supplement, this means that there are two angles that add up to 180 degrees. So now we just need to think of the two angles that add up to 180, but are 20 degrees different from dach other. In this case, we have one angle that is 100 degrees, and one 80 degrees. These add up to 180, and 80 is 20 degrees less than its supplement, which is 100.
The three angles, together, add to 180 degrees. So two of them add to 65+15 = 80 degrees means the third must be 100 degrees.
The inner angles of a triangle add up to 180 degrees. 180 - (70 + 30) = 80 degrees.
80 degrees Celsius = 176 degrees Fahrenheit