Bonjour
Aire ABCD = 60² = 3600
Aire AEFG = 40(60-x)
Aire AEFG = 1/4 * Aire ABCD
40(60-x) = 1/4 * 3600
2400 - 40x = 900
40x = 2400 - 900
x = 150/4
x = 37.5 cm
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Bonjour
Aire ABCD = 60² = 3600
Aire AEFG = 40(60-x)
Aire AEFG = 1/4 * Aire ABCD
40(60-x) = 1/4 * 3600
2400 - 40x = 900
40x = 2400 - 900
x = 150/4
x = 37.5 cm