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5a= 110
a= 22
jd sudut yg blm diket: 66 derajat dan 44 derajat
(ii) 57+33+b=180
160+b= 180
. b= 20 derajat
(iii) 3d+7d+2d = 180
12d = 180
d= 15
jd sudut2ny 45,30, dan 105 derajat