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2+3=5
berpelurus= 180 derajat, maka:
m sudut A= 2/5x180= 72 derajat
m sudut B= 3/5x180= 108 derajat
selisih:
3-2=1
berpenyiku=90 derajat, maka:
1/5x90= 18 derajat