Congruence of Triangles
Congruence of Triangle
Congruence means that one figure will exactly superimpose the other figure. Two congruent line segments have the same length and conversely two lines segments of equal length are congruent. or we can say that two line segments are congruent if and only if their lengths are equal. Similarly two angles are congruent if and only if their measures are equal, or we can say that two angles BAC and EDF are congruent if m
Two triangles are congruent if and only if one of them can be made to superpose on the other, so as to cover it exactly. Let be two congruent triangles. Then, we can superpose
on
, so as to cover it exactly. In such a superposition the vertices of
will fall on the vertices of
, in some order. Let us assume that the vertex A falls on vertex D, vertex B on vertex E and vertex C on vertex F.
Then, side AB falls on DE, BC on EF and CA on FD. Also superposes on the corresponding angle
and
. Thus, the order in which the vertices match, automatically determines a correspondence between the sides and angles of the two triangles. And, if the superposition is exact i.e. the triangles are congruent, the corresponding sides and angles are congruent. Consequently, we get six equalities three of the corresponding sides and three of the corresponding angles. If
superposes on
exactly such that the vertices of
fall on the vertices of
in the following order
|
Then, we have the following six qualities |
 |
Congruence Relation
From the definition of congruence of two triangles, we obtain the following results:
(i) Every triangle is congruent to itself i.e.,
(ii) If , then
(iii) If , and
, then
Note: It is important to write the correspondence of vertices correctly for writing of congruence of triangles in symbolic form because but
and the symbolic form is used to write corresponding parts of congruent triangles {C.P.C.T.}
If | |||
| Right Option : A | |||
| View Explanation | |||
If | |||
| Right Option : A | |||
| View Explanation | |||
Which of the following is not a criteria for congruency ? | |||
| Right Option : D | |||
| View Explanation | |||
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