Question

Find whether the sides of the triangle as given below form a right-triangled or not: $9$ cm, $12$ cm and $15$ cm

Answer 1

In a right angled triangle, sum of squares of two sides should be equal to the square of the third side.
Here, $9^2=81$

${12}^2=144$

${15}^2=225$
Since, $81+144=225$, the sides form a right angled triangle.