Summary

1.Two figures are , if they are of the same shape and of the same size.

2.Two circles of the radii are congruent.

3.Two squares having the same length are congruent.

4.If two triangles ABC and SKP are congruent under the correspondence A ↔ P, B ↔ K and C ↔ S, then symbolically, it is expressed as ∆ ABC ≅ ∆ PKSSPKSKP.

5.If two sides and the included angle of one triangle are equal to two sides and the included angle of the other triangle, then the two triangles are congruent Congruence Rule.

6.If two angles and the included side of one triangle are equal to two angles and the included side of the other triangle, then the two triangles are congruent Congruence Rule.

7.If two angles and one side of one triangle are equal to two angles and the corresponding side of the other triangle, then the two triangles are congruent Congruence Rule.

8.If three sides of one triangle are equal to three sides of the other triangle, then the two triangles are congruent Congruence Rule.

9.If in two right triangles, hypotenuse and one side of a triangle are equal to the hypotenuse and one side of other triangle, then the two triangles are congruent Congruence Rule.

10.Angles opposite to equal sides of a triangle are .

11.Sides to equal angles of a triangle are equal.

12.Each angle of an equilateral triangle is of °.