Keliling sebuah kebun berbentuk persegi panjang 70m, jika panjangnya 5m lebih dari lebarnya, luas kebun adalah
RonaldRobi
L = x p = 5 + x K = 2p+2l 70 = 2(5+x) + 2(x) 70 = 10+ 2x + 2x 70 = 10 + 4x 4x = 70-10 4x = 60 x = 60/4 = 15 p = 15 + 5 = 20 m l = 15 m L = p.l = 20 x 15 = 300 m²
Semoga membantu, jadikan terbaik ya !
2 votes Thanks 3
salmaazzahra58
Keliling = 70 cm panjang = 5 m + x = 5 m + (70/2) = 5 m + 35 m = 40 m : 2 = 20 m lebar = (K ÷ 2) - p = (70 m ÷ 2) - 5 m = 35 m - 5 m = 30 m : 2 = 15 m L = p x l = 20 m x 15 m = 300 m²
p = 5 + x
K = 2p+2l
70 = 2(5+x) + 2(x)
70 = 10+ 2x + 2x
70 = 10 + 4x
4x = 70-10
4x = 60
x = 60/4
= 15
p = 15 + 5 = 20 m
l = 15 m
L = p.l
= 20 x 15
= 300 m²
Semoga membantu, jadikan terbaik ya !
panjang = 5 m + x
= 5 m + (70/2)
= 5 m + 35 m = 40 m : 2 = 20 m
lebar = (K ÷ 2) - p
= (70 m ÷ 2) - 5 m
= 35 m - 5 m
= 30 m : 2 = 15 m
L = p x l
= 20 m x 15 m
= 300 m²