Question

cbse class 9 maths chapter 7 triangles all theorms solved

Answer 1

Congruency In Triangles

Theorems

Two figures are congruent, if they are of the same shape and of the same size.
Two circles of the same radii are congruent.
Two squares of the same sides are congruent.
If two triangles ABC and PQR are congruent under the correspondence A – P, B-Q and C-R, then symbolically, it is expressed as Δ ABC Δ PQR.
SAS Congruence Rule: 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. (Axiom: This result cannot be proved with the help of previously known results.)

ASA Congruence Rule: 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 (ASA Congruence Rule).
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Answer 2

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