what is pythagoras theorem please explain

 Pythagoras Theorem:

In a right triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides of the triangle.
In a right triangle, side opposite to the 900 is always the hypotenuse. The square of the side opposite of the 900 in a right triangle is equal to the sum of squares of the other two sides.
 
∆ ABC is a right triangle, right angled at B. Here, AC is the hypotenuse of the right ∆ ABC.
So, the square of AC is equal to the sum of the squares of the other two sides AB and BC.
I.e., AC2 = AB2 + BC2 (Pythagoras Theorem)

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Pythagoras Theorem states that; in a right triangle, the square of the hypotenuse is equal to the sum of the squares of the remaining sides.
 
In the given triangle, a 2 + b 2 = c 2.
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