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Sudut R = 180 - (Sudut Q+sudutP)
= 180 - (37,5+37,5)
= 180 - 75
=105 derajat
QR=\
Sudut Q=sudut P
37,5 derajatx2=75 derajat
270 derajat-75 derajat=195 derajat.