The length of the sides of four triangles are given, Which is not a right triangle?

a.10mm,24mm,26mm
b.20mm,48mm,52mm
c.5mm,12mm,13mm
d.11mm,24mm,26mm

Question

The length of the sides of four triangles are given, Which is not a right triangle? 

a.10mm,24mm,26mm
b.20mm,48mm,52mm
c.5mm,12mm,13mm
d.11mm,24mm,26mm

anonymous · Answer

You are searching for the set of numbers such that $a^2+b^2\ne c^2.$

anonymous · Answer

Use the converse of pythagoras theorem , which says -> 

A triangle is a right triangle, if the sum of the squares if two (smaller) sides = the square of the (bigger) side i.e hypotenuse .. :)