If a triangle has sides of 6 inches , 8 inches , and 11 inches , is it a right triangle

Answer 1

In this case, you can rely on known right triangles (3,4,5)

if you double the (3,4,5) triangle you would get (6,8,10)

So, (6,8,11) is not a right triangle as the hypotenuse is too long.

(11 is the hypotenuse as it is largest, always in a right triangle)