What is the formula for hypotenuse if you are measuring a non right triangle... I will give brainliest to first person

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning

Find the condition that the zeros of the polynomial f(x) = x^3+3px^2+3px+r may be in a.p.

How do i simply this radical expression?