Is 7 8 12 a right triangle?

Answer 1

7, 8 & 12 are the sides of the triangle.

And, for a right angled triangle the Pythagoras theorem is always applicable!

Pythagoras theorem states that for a right angled triangle:

(Longest Side)2 = (Side-1)2 + (Side-2)2

(Longest side is called as the hypotenuse).

So, using data in the question:

If its a right angled triangle--->122 = 72 + 82

i.e. 144 = 49 + 64 => 144 = 113, which is clearly not true!

Hence, the triangle with the given sides is not a right triangle.