Answer:
136
Step-by-step explanation:
a straight line is 180 degrees they give 112 degrees for an angle the other angle that following the line is 180 degrees minus 112 which equals to 68 degrees the angles across are congruent
to find measure of Arc DC I do 68 * 2 which equals to 136
if you want to find y you have to subtract 80 from 136
Y= 56
