Explain the difference between aas congruence and asa

ASA - If two pairs of angles of two triangles are equal in measurement, and the included sides are equal in length, then the triangles are congruent.

AAS - If two pairs of angles of two triangles are equal in measurement, and a pair of corresponding non-included sides are equal in length, then the triangles are congruent.

(x-h)^2 +(y-k)^2 = r^2

(h,k) are the two points