Question

the sides of a triangle are 36 CM 15 cm and 39 CM prove that the triangle is a right Triangle

Answer 1

$36 {}^{2} + 15 {}^{2} = 1296 + 225 = 1521$
$39 {}^{2} = 1521$
$36 {}^{2} { + 15}^{2} = 39 {}^{2}$
By pythagorus theorem, it is a right angled triangle.