To calculate the length of fence Jolon needs to find the perimeter of the

garden.

Since the garden is a rectangular garden, use the formula for the perimeter

of the rectangle.

The perimeter P of a rectangle is given by the formula,

P = 2L + 2W = 2 (L + W)

Where L is the length and is W is the width of the rectangle.

The perimeter P of a rectangle/garden is

P = 2 (6 m + 4 m)                  (Substitute: L = 6m and W = 4m)

   = 2 10 m                          (Add : 6 + 4 = 10)

   = 20 m                                  (Multiply: 2 10 = 20)

Jolon needs to purchase 20 m fencing.