Hypotenus of a right triangle?

Handy rule for Rt. triangles. 3,4,5 is the relationship. so since 6 is twice 3 and 8 is twice 4 then twice 5 = 10 and thats your answer. neat HUh? always works for RT.triangles You can always use Csq= Asq+bsq then get the sq rt of c asthe answer but it's the same and a lot less work..