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180 = 12a +12
168 = 12a
14 = a
sudut DBC = 7a + 8 = 7 (14) + 8 = 98 + 8 = 106
12a + 12 = 180
12a = 168
a = 14
Sudut DBC = 7a + 8
= 7(14) + 8
= 98 + 8 = 106