Answer:
m∠A=30°
Step-by-step explanation:
we know that
Vertical Angles are the angles opposite each other when two lines cross.
Vertical angles always are congruent
In this problem
m∠A=m∠B ----> by vertical angles
we have
m∠A=x
m∠B=3x-60
substitute
\(3x-60=x\)
Solve for x
\(3x-x=60\)
\(2x=60\)
\(x=30\)
therefore
m∠A=30°
