If the perimeter of a rectangle is 56 cm and the width is 13 cm, what is the length?

1 Answer
Nov 20, 2015

Length #l=15#.

Explanation:

Perimeter #p# is a sum of the lengths of all four sides of a rectangle - two sides constituting width (#w#) and two sides constituting length (#l#).

Hence,
#p = 2w+2l#

If #p=56# and #w=13#, we get an equation for #l#:
#56 = 2*13+2l#

Solution to this equation:
#l=15#