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LL Congruence theorem says: If the two legs of one right triangle are congruent to the two legs of another right triangle, then the two right triangles are congruent.
SAS postulate or SSS postulate.
Angle -gieco53
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).
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.