Is a triangle with sides of length 6 foot 21 foot 23 for a right triangle show how you know

No

Step-by-step explanation:

This is not a right triangle.

The longest side (23) would need to be the hypotenuse, and the two other shorter sides (6 and 21) would be Leg 1 and Leg 2. By using the pythagorean theorem to see if it is a right triangle you take leg 1 and square it and add it to leg 2 squared (6²+21²) then find the square root of that ( which equals about 22. So no because in order for it to be a right triangle 22 would need to be 23.