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AD = BC
2x + 5 = x + 7
x = 2
b)
AD = 2x + 5
= 2(2) + 5
= 9
c)
sudut BAD = sudut BCD = 60°
ABC = (360 - 60 - 60) : 2
= (360 - 120) : 2
= 240 : 2
= 120°
Maaf kalau salah ^^