Theorem 7.4 (SSS congruence rule) : If three sides of one triangle are equal to the three sides of another triangle, then the two triangles are congruent.

If .... sides(s) of a triangle is/are equal to the three sides of other triangle the two triangles are congruent.

If three angles of one triangle are equal to corresponding three angles of an other triangle then triangles are congruent.

Assertion (A) : If two triangle have same perimeter , then they are congruent. Reason (R) : If under a given correspondence, the three sides of one triangle are equal to the three sides of the other triangle, then the two triangles are congruent.

If the three angles of one triangle is equal to that of the three angles of another triangle,the triangles are called

If two angles and a side of one triangles are equal to two angles and a side of another triangles , the triangles are congruent.

If in two right triangles, the hypotenuse and one side of one triangle are equal to the hypotenuse and one side of the other triangle, then the two triangles are congruent. 1. PL is an altitude from P of DeltaPQR on QR such that QL = LR. Then,

Angle Angle Side (AAS) Congruence-If any two angles and a non-included side of one triangle are equal to the corresponding angles and side of another triangle; the two ttriangles are congruent.