# Can the sides 21, 28, 35 be a right triangle?

Jun 30, 2015

Letss try using Pythagoras Theorem with $c = 35$ as hypotenuse, you get:
${c}^{2} = {a}^{2} + {b}^{2}$
${35}^{2} = {21}^{2} + {28}^{2}$
$1225 = 441 + 784 = 1225$ YES!