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2/3B +3/3B=180
5/3 B=180
b=180:5/3
b =180 x 3/5=108 derajat
A=180-108
= 72 derajat
A+B=90 derajat
2/3B +3/3B=90
5/3 B=90
b=90:5/3
b =90 x 3/5=54 derajat
a=90-54=36
selisih=54-36=18 derajat