Pretty sure it’s a circle , why would it be a rectangle and a right angle
Verrrrrrry interesting ! / / / Every multiple of an even number is another even number. When you take any whole number and the one 'before' it ... no matter which direction 'before' means .... one of the numbers is even. So their product is a multiple of an even number, and it must be another even number.
Complete the Square:
Plug your numbers in this function
You get this
That equals 
