Question

A rectangle is 3 times as long as it is wide. if the distance around the rectangle is 16.8 kilometers, what is the area of the rectangle

Answer 1

d=16.8
d=2 (3w)+2w
16.8=6w+2w
16.8=8w
w=2.1
l=3w
l=3*2.1
l=6.3
a=lw
a=6.3*2.1
a=13.23