Complete the two-column proof by circling the correct choices in steps b through d. Given:
B
X
I
) 60
A
o
с
Prove: x = 240
mZAOB+ m ZBOC = 180
a. By the definition of supplementary angles
b. Reflexive / Substitution Property of Equality
* +60 = 180
2
= 120
C. Addition / Subtraction Property of Equality
2
x=240
d. Multiplication/Division Property of Equality