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If the hypotenuse and one leg of a right angled triangle are congruent to the hypotenuse and leg of another right angled triangle, then the two triangles are congruent.
Neither. A theorem is a proven mathematical statement. This says nothing about how easily it can be proven. e.g. the Pythagorean Theorem is easily proven, but Fermat's Last Theorem is extremely difficult to prove.
52 + 122 = 25 + 144 = 169 = 132 This calculation confirms that the three sides of length 5, 12 and 13 cm form a right angled triangle with the side of length 13cm being the hypotenuse.