1. The relationship between a2+b2=c2 is that a+b=c (leg+leg=hypotnuse.)
2. The way I figured out the hypotenuse was by using the 2 legs (12cm and 5cm) to find the hypotenuse.
Square root of c =Square root of 169
3. The side lengths are 6,8 and 11cm. the way to find out if this triangle is a right triangle is to add up the two legs and see if they equal the hypotenuse.
This is not a right triangle.