First you can find D since the rest of the 180° on the bottom has 132° already, so 180–132=48. So, 48–12=4d
36=4d
9=d
So, you have 42° (on the opposite side), 62°, and 48°c making up 155. So, 180–155=25. And to find c, add 15.
25+15=40
40÷20=2
So, c=2
c=2
d=9
