Keliling persegi panhang 48cm panjangnya 14cm lebar….cm

Keliling persegi panjang = (panjang x 2) + (lebar x 2)
Lebar = Keliling – (panjang x 2)
          = 48 cm – (14 cm x 2)
          = 48 cm – 28 cm
          = 20 cm : 2
          = 10 cm
Jadi, lebarnya 10 cm

Keliling persegi panjan = 48 cm
Panjang = 14 cm
Lebar = ? cm

K = 2(p + l)
48 = 2(14+x)
48 = 28+2x
48-28 = 2x
20 = 2x
x = 20/2
x = 10 cm