Question

A triangle has side lengths of 20 cm 27 cm and 21 cm. Is the triangle a right triangle? SHOW YOUR WORK TO PRO
VE IT!

Answer 1

When a triangle is a right triangle, Pythagorean theorem must work on it. 
The Pythagorean theorem states: a^2+b^2=c^2
20^2+21^2=27^2
400+441=729
841=729
false

Therefore, the triangle is not a right triangle