Triangles

Maths

Class 9

Establish a correspondence between the vertices, sides, and angles of two congruent triangles.Distinguish correspondences that lead to congruence from those that do not and use the order of vertices to show correspondences in congruence notation. Give the conditions for congruence in terms of the minimum information to specify a triangle completely. Demonstrate and apply the SSS criterion for congruence, show that AAA is not a sufficient criterion for congruence, demonstrate and apply the SAS and ASA criteria for congruence and demonstrate and apply the RHS criterion for congruence.

ExampleDefinitionsFormulaes

$△≅△DOB$

$△≅△BOD$

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Any two circles of radii $4cm$ each are congruent.

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