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biarpun kayak tangga, sebenarnya panjangnya sama
jadi keliling bangun itu = 12 + 12 + 8 + 8 = 40
2.
a+ b = 180 (sudut saling pelurus)
2a = 3b
--di substitusikan
2 (180 -b) = 3b
360 - 2b = 3b
5b = 360
b = 72
maka a = 180 - 72 = 108
3, kok sudut BCA? sudut DCA kali ya
sifat yg di pakai : sudut sehadap
5x = 2x + 45
3x = 45
x = 15
BCF = 5 x 15 = 75
CFG = 75
DCA = 75