Let’s consider the following right triangle ABC.
The right angle in the triangle is angle ABC.
You can see from the figure that the sides are of length 3,4 and 5 centimeters.
Now let us simply compute the sum of the squares of the smaller sides of the triangle, that is, sides AB and BC to be precise. This works out as
3 squared plus 4 squared which is 9 plus 16 which gives 25.
Now the square of the longest side AC, which is opposite the right angle of the triangle is 5 squared or 25. Is this a coincidence for this one triangle alone? Or is it a fact true for all right triangles?
Let us look at one more example to see if we see this pattern repeating.