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AD = BC
2x + 5 = x + 7
x = 2
b. AD = 2x + 5
= 2*2 + 5
= 9cm
c. BAD = BCD
= 60 Derajat
ABC =( 360 - ( 2*BAD)) : 2
=( 360 - 120): 2
= 240 / 2
= 120 derajat