Question

ZABC is a straight angle. Which equation can be used to find the measure of

the unknown angle?
?
450
А
B
1)
45 x 180 = 0
180 = 45 = 0
180 – 45 = 0
45 + 180 = 0
Done

Answer 1

since ABC is a straight angle, it measures 180°. since you have 45° already, you can input it into an equation.

45 + x = 180

or

180 - 45 = x

Answer 2

180-45=135

Explanation:

The unknown angle can be found by subtracting 180-45=135. ABC measures 180 because it is a straight angel and ABC meausres 45.