Question

The sides of a triangle are 20 cm, 9 cm and 12 cm. Is this triangle a right-angled triangle?​

Answer 1

Answer:

No it is not a right angled triangle because right angle triangle have the smallest two sides square is equal to the third side square and in this situation the sum of square of 9 and 12 is 225 and this is not equal to the square of square of 20.

Answer 2

Answer:

Step-by-step explanation:

If these sides follow pythagorus theorem then it is a right angled triangle.

H ² = (20)² = 400

P² + B² = (9)²+(12)²= 81+144= 225

So Pythagorus theorem is not obeyed so it is not a right angled triangle.