In the HA theorem A stands for angle. HA is a specific case of ASA, because if you know the angle A, then the other angle is (90-A).
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The hypotenuse angle theorem, also known as the HA theorem, states that 'if the hypotenuse and an acute angle of one right triangle are congruent to the hypotenuse and an acute angle of another right triangle, then the two triangles are congruent.'
For a right angle triangle in Pythagoras' theorem of a2+b2 = c2 the letters a and b stand for the shorter sides and c stands for the longest side which is the hypotenuse.
The Pythagorean theorem is used to find the length of the hypotenuse of a right triangle. It states that the length of the hypotenuse is equal to the square root of the sum of the squares of the other two sides.
the Pythagorean Theorem
pythagorean theorem.