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POQ : QOR = 72/108 = 2:3
PQ : QR = 2 : 3
PQ/QR = 2/3
3PQ = 2QR
3(35) = 2QR
QR = 3(35) : 2
QR = 105 : 2 = 52,5 cm
b.
Keliling = 2 x (52,5 + 35)
Keliling = 2 x 87,5 = 175 cm