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 = 6 m and W = 4 m)

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

  = 20 m                                  (Multiply 2 X 10 = 20)

Jolon needs to purchase 20 m fencing.