A triangle with two angle each of 90o and 60o, has its third angle _______ .
60o
40o
80o
30o
Measure of third angle = 180o - 90o - 60o = 30o
Two angles of a triangle are 60o and 40o. Find its third angle.
Third exterior angle of a triangle with two exterior angles 90o and 135o is _______ .