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Hypotenuse:  The longest side of a right triangle, opposite the right angle.

Right-Angle:  An angle of 90°, as in a corner of a square or at the intersection of two perpendicular straight lines.

Pythagoras Theorem:  Pythagoras' theorem, is a fundamental relation in Euclidean geometry among the three sides of a right triangle. It states that the square of the hypotenuse is equal to the sum of the squares of the other two sides.

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To answer this question you have to multiply the numbers on the side of the triangle by two and you have to add the two lowest answers and if it adds up to the highest answer then the triangle is right-angled.

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Tutorial On How To Use Pythagoras's Theorem

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Tutorial On How To Use Pythagoras's Theorem

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Pythagorean Theorem - MathHelp.com - Geometry Help