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120 x 50 = 75 x n
6000 : 75 = n
80 = n (A)
12.L = 1/4 x 22/7 x 10 x 10
= 22/28 x 100
= 78,5 cm
L segitiga =1/2 x 10 x 10
= 50 cm
L diarsir = 78,5 - 50
28,5 cm (D)