Question

The diagonal of a square is 3 feet long. Find its perimeter.

My answer:

a^2+b^2=c^2

x^2+x^2=3^3

2x^2=9 divide both side by 2

x^2=4.5

x=√4.5
x=2.1 feet

Is this right?

Answer 1

Obviously the perimeter cannot be shorter than one of its sides.

2.1 is the length of each of its sides.

Now find the perimeter.

Answer 2

how can the perimeter be less than the diagonal?

you found one of the sides...the perimeter is all four