Réponse:
a) A = L×l - L×l
A = 10×7 - 4×1
A = 70 - 4
A = 66 m²
b) A = c×c + L×l
A = 4×4 + 10×4
A = 16 + 40
A = 56 cm²
c) A = B×h
2
A = 5×2
2
A = 10
2
A = 5 dm²
d) A = L×l + B×h
2
A = 8×3 + 8×1
1
A = 27 + 8
A = 35 m²
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