Question

Two angles of a triangle measure 12 and 40. What is the third angle?

Answer 1

The sum of angles in the triangles is 180 degrees 12+40+X=180

52+X=180

X=180-52 = 128 degrees

X is the third angle of the triangle

Answer 2

The third angle is 128°.

Explanation:

We need to remember that the sum of the 3 angles of a triangle is 180°, hence if we have 2 angles, the third angle is:

`180 = \alpha + \beta + \theta`

`180 = 12 + 40 + \theta`

`\theta = 180 - 52`

`\theta = 128`

Therefore, the third angle is 128°.

I hope it helps you!