Hey there :)
We know that the sum of all 3 angles in a triangle is 180°
Two angles are given to be 77° and 62°
We can find the 3rd angle by:
77 + 62 + x = 180 ( x is the angle to be found, you can use any variable, if not given)
180 - ( 77 + 62 ) = x
180 - 138 = x
41°
