Question

The perimeter of a rectangle is 40 cm. If it has a length of 16 cm, how
wide is it?

Answer 1

Width = 4 cm

Explanation:

• We know that the formula for perimeter (P) of a rectangle is P = 2l + 2w,

• where l is the length
• and w is the width.
• Since we're already given the perimeter and the length, we can solve for width by plugging in the values for perimeter and length in the equation and solve for w:

40 = 2(16) + 2w

40 = 32 + 2w

8 = 2w

4 = w

We can check that our answer is correct by plugging in 16 for l and 4 for w in the formula and check that we get 40:

40 = 2(16) + 2(4)

40 = 32 + 8

40 = 40