Pythagoras' theorem is applicable to right angle triangles.
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In a right triangle, the Pythagorean theorem states that the square of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the other two sides. Additionally, the converse of the Pythagorean theorem states that if the square of one side is equal to the sum of the squares of the other two sides, then the triangle is a right triangle.
right triangle
HyL Congruence Theorem : if a leg and the hypotenuse of one right triangle are congruent to a corresponding leg and the hypotenuse of another right triangle,then the triangles are congruent._eytiin cu ;)
HL and HA
It does not necessarily prove congruence but it does prove similarity. You can have a smaller or bigger triangle that has the same interior angles.
A triangle having 3 congruent sides is an equilateral triangle