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l = l
K = 2 ( p + l)
70 = 2 (5 + l + l)
70 = 2 (5 + 2l)
70 = 10 + 4l
4l = 70 - 10
4l = 60
l = 60/4
l = 15 m
p = 5 + l
= 5 + 15 m
= 20 m
L = p × l
= 20 × 15 m²
= 300 m²
K = 70 m
Dit : L = ... ?
K = 2 x (p + l)
70 = 2 x (l + 5 + l)
2l + 5 = 35
2l = 30
l = 15 m
p = l + 5 = 15 + 5 = 20 m
L = p x l = 20 m x 15 m = 300 m²