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nah kalo berpelurus nih
a. m<A + m<B = 180 derajt
2/3m<B + m<B = 180
5/3 m<B = 180
m<B = 180 x 3/5 = 108 derajat
m<A = 2/3 m<B = 2/3 108 = 72 deraajt
b.kalo saling berpenyiku
m<A + m<B = 90
5/3m<B = 90
m<B = 90 x 3/5 = 54 derajat
m<A = 54 x 2/3 = 36 derajat
selisihnya adalah 18 derajat
moga bermanfaat ^^