Răspuns:
A = 24 cm²
Explicație pas cu pas:
P = 2(L+l)
L = 1,5×l
2(1,5×l + l) = 20
1,5×l + l = 10
2,5×l = 10
l = 10:2,5
l = 4 cm
L = 1,5×l = 1,5×4 = 6 cm
Aria = L × l = 6 × 4 = 24 cm²
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Răspuns:
A = 24 cm²
Explicație pas cu pas:
P = 2(L+l)
L = 1,5×l
2(1,5×l + l) = 20
1,5×l + l = 10
2,5×l = 10
l = 10:2,5
l = 4 cm
L = 1,5×l = 1,5×4 = 6 cm
Aria = L × l = 6 × 4 = 24 cm²