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= 5/qr = 6/9
= 6qr = 5×9
= qr = 45/6
= qr = 7,5cm
ad/ps = ab/pq
= 4/ps = 6/9
= 6ps = 4×9
= ps = 36/6
= ps = 6
cd/sr = ab/pq
= cd/6 = 6/9
= 9cd = 6×6
= cd = 36/9
= cd = 4