Question

What is the value of x?

Answer 1

180 - 80 - 55 = 45
Because triangle has 180 degree

Answer 2

Triangle angles measure 180 degrees altogether. 180-80-55=45 or you can solve it this way 80+55+x=180

Subtract 80 from both sides

Subtract 55 from both sides

You're left with x = 45