bonjour
figure 1
40 * 45 = 1 800
aire = 1 800 mm²
figure 2
20² = 400
aire = 400 mm²
1 800 - 400 = 1 400 mm²
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bonjour
figure 1
40 * 45 = 1 800
aire = 1 800 mm²
figure 2
20² = 400
aire = 400 mm²
1 800 - 400 = 1 400 mm²