Question

Keliling sebuah persegi panjang 48cm.jika panjang 2xlebar,maka hitunglah panjangnya!

Answer 1

K=2p+2l
48 cm = 2 x 2l + 2l
48 cm = 4l + 2l
48cm = 6l
l = 8 cm

Answer 2

L = l
p = 2l

Keliling = 48
2 (p + l) = 48
2 (2l + l) = 48
2 (3l) = 48
6l = 48
l = 48/6
l = 8


panjang = 2 x 8
            = 16 cm