PERIMETER

Perimeter of a square below is 44mm. Find the length of one side.

Solution

Perimeter = 4 x side

44 = 4(a - 5)

44 = 4a – 20

44 + 20 = 4a

64 = 4a

64 =  4a

 4      4

16 = a

Now the side = a – 5

                       = 16 – 5

                       = 11

Hence length of one side is 11mm