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triangles can be congruent if any of following rule is established:-

1) SSS ( stands for side, side, side)

2) SAS (stands for side, angle, side)

3) ASA ( stands for angle, side, angle)

4) AAS ( stands for angle, angle, side)

5) RHS (stand for right angle, Hypotenuse, side)

Apart from congruent triangles, there is also transformation associated with individual triangles. To understand clear concept,

we will take one congruent triangle example and one transformation example. The examples are shown below :-

This is because all the sides of fig (1) is equal to the all the sides of fig (2).

Therefore by SSS axiom

Figure 1 is a triangle which when rotation towards left 90 degrees

(3,1), (3,2) and (4,2) = (3,1), (3,2) and (4,1)

Then this figure is moved, we get figure 2

(3,1), (3,2) and (4,1) = (2,2), (2,3) and (3,2)