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p = l + 5
K = 2 (p + l )
70 = 2 (l+5+l)
70 = 2(2l + 5)
70 = 4l + 10
70-10 = 4l
60 = 4l
60 ÷ 4 = l
15 = l
p = l + 5 =15 + 5 =20
L = p×l
= 20×15
=300m²
p= 5 + l
K= 2(p + l)
70= 2(5 + l + l)
70= 2(5 + 2l)
70= 10 + 4l
70 - 10= 4l
60= 4l
4l= 60
l= 60/4
l= 15 m
maka :
p= 5 + l
= 5 + 15
= 20 m
L. persegi panjang :
p × l
20 × 15
300
Jadi, Luas kebun adalah 300 m².