This is a diagram of a staircase railing. which is a true statement about the measure of angle dcj marked rº on the diagram? (picture included)
additional information: ag || ray cj and ray ad || ray fj
a. it equals 30 degrees by the alternate interior angles theorem
b. it equals 30 degrees by the corresponding angles postulate
c. it equals 50 degrees by the alternate interior angles theorem
d. it equals 50 degrees by the corresponding angles postulate