What is the Pythagoreum Theorem?

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neela | High School Teacher | (Level 3) Valedictorian

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Pythagoras theorem is relates the sides of a triangle.

In a right angled triangle the sum of the squares of the sides that contain the right angle is equal to the square on the the third side.

Let ABC be a right angled triangle with right angle at B. Then AB ,  BC  are the sides that contain right angle . Then Ac is the side opposite to  the right angle. Then  AC^2 = AB^2+BC^2.

It is also true that in any triangle ABC if sum of the squares of any two sides AB and BC  is equal to the third side AC, then the triangle is a right angled triangle with right angle contained by AB and BC.

Pythagoras theorem could be used to  verify  whether a triangle is right angle. It could be used to create 90 degree measure of angle with ordinary scale (not even calibrated) .

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