Question 285819
let's put them in order of size
12,16,20
divide by 4
3,4,5 yes it is the classic 3,4,5 right triangle
What is another way using the Pythagorean theorem ?
the largest side will be the hypotenuse
12^2+16^2=20^2
144+16^2=400
Does 16^2=256?
if so then it is a right triangle.