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5 = x
180 - 12x = x + 5y
180 - 60 = 5 + 5y
120 = 5 + 5y
115 = 5y
23 = y
9. AD, BC, FG, EH
x = 5
12x+x+5y = 180 (sudut saling berpelurus)
13x+5y = 180
13.5+5y = 180
65+5y = 180
5y = 180-65
5y = 115
y = 23
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yg tegak lurus DC adalah HD, GC, AD, dan BC