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cpq = cab
cqp = cba
cab = 67° (karena sehadap dengan cpq)
cqp = 180° - (67° + 30°)
= 83°
cba = 83° (karena sehadap dengan cqp)
pqb = 180° - 83°
= 97°
apq = 180° - 67°
= 113°
maaf kalo salah.