Question

if the measure of 2 angles of a triangle is 45 degree and 80 degree then the measure of the third Angle is

Answer 1

In order to solve this problem, you need to know one basic rule in trigonometry:

The angles inside a triangle always add up to 180 degrees.

Keeping this in mind, we know that 35 plus 45 plus the third angle equals 180 degrees.

35+45+x=180

80+x=180

x=180–080

x=100

The last angle in the triangle is 100 degrees.