helllppppppppppp me! pelissss

Diketahui, persegi panjang:
• Keliling = 50cm
• Panjang = lebar+5

Ditanya :
• Luas persegi panjang

Jawab :
Keliling = 2(p+l)
50cm = 2(l+5+l)
50cm = 2(2l+5)
50cm = 4l + 10
4l = 50 - 10
4l = 40
l = 10cm

panjang = lebar + 5cm
panjang = 10cm + 5cm = 15cm

Luasnya = p × l = 15 × 10 = 150cm²

Jawabannya B.

Dik = keliling = 2p+2l & p= l + 5

keliling = 2p + 2l
50 = 2(l+5) + 2l
50 = 2l + 10 + 2l
-4l = 10 - 50
l = -40/-4
l = 10 cm


keliling = 2p + 2l
50 = 2p + 2 × 10
50 = 2p + 20
- 2p = -30
p = 15

luas = p×l
= 15×10
= 150

jadi luas = 150 cm