Diketahui luas 48cm panjang 12cm ditanya lebar dan kelilingnya

L = 48 cm
P = 12 cm
L = p x l
48 = 12 x l
l = L : P
l = 48 : 12
l = 4 cm

K = 2 x (p + l)
K = 2 x (12 + 4)
K = 2 x 16
K = 32 cm