Question

The measure of two angels of a triangle are 47° and 72°. What is the measurement of the third angel?

Answer 1

180-47-72=61°

if the triangle has a 180 degree angle, subtract 180 from the two angles already given.

Answer 2

61 degrees

The reasoning is simple, a triangle must always add up to 180 degrees
47 + 72 = 119

180 - 119 = 61 degrees

Hope this helps!