jawabnya pakai caranya ...

11.c.130
12.d.60

itu aku jawab pakai busur derajat kok
s3moga membantu ya....

5p - 60 = 2p.
5p - 2p = 60.
3p = 60.
p = 60/3.
p = 20.

∠BAD = 5p - 60.
∠BAD = 5(20) - 60.
∠BAD = 100 - 60.
∠BAD = 40.
Jawaban : B(12)

∠ABC = 180 - ∠BAD.
∠ABC = 180 - 40.
∠ABC = 140.
Jawaban : D(11).