Question

a rectangular field is 45 feet wide and is enclosed by 210 feet of fencing what is the area of the field in square feet

Answer 1

Find the length of the field first.  To do this, write a formula for the perimeter, P, of the field:  P = 210 ft = 2(45 ft) + 2L.

Then 2L = 210 - 90 = 120, and L = 60 (feet).

The area of the field is thus WL = (45 ft)(60 ft) = 2700 sq ft