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12x+12*=180*
12x=180*-12*
12x=168*
x=14
Besar CED= 3x+8
=3x14+8
=42+8
=50
12x + 12 = 180°
12.x = 180 - 12
12x = 168
x = 168/12
x = 14
∠ CED = 3x + 8
= 3 .14 + 8
= 42 + 8
= 50° ..... jawaban : A