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panjang = 5 + l
K = 70 m
maka :
K = 2 x(p+l)
70 = 2 x (5+l+l)
70 = 2 x (5+2l)
70 = 10 + 4l
4l = 70-10
l = 60/4
l = 15 cm
jd panjang = 5 + 15 = 20 cm
Luas = 20 x 15 = 300 cm²
p = 5 + l
2p + 2l = 2(5 + l) + 2l
= 10 + 2l + 2l
= 10 + 4l
10 + 4l = 70
4l = 70 - 10
4l = 60
l = 60 / 4
l = 15 meter
p = 5 + l
= 5 + 15
= 20 meter
luas kebun = 20 * 15
= 300 m²