Question

Find the value of z.

Answer 1

The 3 outside angles of a triangle equal 360 degrees.

So you have:

Z + Z-13 + Z+10 = 360

Combine the like terms:

3Z - 3 = 360

Add 3 to each side:

3z = 363

Divide both sides by 3:

Z = 363 / 3

Z = 121