A section of a roller coaster track forms a parallelogram ABCD.
If m∠ABC = 72°, what is m∠DAB?
Responses
A 108°108°
B 144°144°
C 216°216°
D 72°
Since opposite angles of a parallelogram are congruent, we know that m∠ABC = m∠CDA = 72°.
Therefore, m∠DAB = 180° - m∠ABC - m∠CDA
m∠DAB = 180° - 72° - 72°
m∠DAB = 36°
So the answer is not among the given choices.