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QR = 28/21 x 9
QR = 12 cm
KL = 21 cm = 7 cm (dibagi 3)
KN = 9 cm = 3 cm (dibagi 3)
KL = SR
7 cm = 28 cm
Maka, SR = 4 x KL
Maka, QR = 4 x KN
= 4 x 3
= 12 cm