Suatu kebun berbentuk persegi panjang . panjang kebun tersebut 15 m lebih panjang dari lebarnya . jika keliling kebun tersebut 130m, hitunglah a.panjangnya b.lebarnya c.luasnya
vhetha
Misal lebar = x pjg = x + 15 k = 2 × (p + l) 130 = 2 × (x + 15 + x) 130 = 2 × (2x + 15) 130 = 4x + 30 4x = 130 - 30 = 100 x = 100 ÷ 4 = 25 m = lebar pjg = 25 + 15 = 40 m L = p × l = 40 × 25 = 1000 m²
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ibrohim11
Keliling= 130m maka, panjang= 45m lebar=30m luas= P x L = 45 x 30 = 1350m
pjg = x + 15
k = 2 × (p + l)
130 = 2 × (x + 15 + x)
130 = 2 × (2x + 15)
130 = 4x + 30
4x = 130 - 30 = 100
x = 100 ÷ 4 = 25 m = lebar
pjg = 25 + 15 = 40 m
L = p × l
= 40 × 25
= 1000 m²
maka, panjang= 45m
lebar=30m
luas= P x L = 45 x 30 = 1350m