I still din't understand diffrence between SAS and RHS criterion in the above Video.

SAS Congruence criterion:

If under a correspondence, two sides and the angle included between them of a triangle are equal to two corresponding sides and the angle included between them of another triangle, then the triangles are congruent.



∠C = ∠P (Included angle between the two sides)


So, by SAS congruence rule, ΔABC ΔPQR


RHS Congruency


The main difference between RHS and SAS is that RHS is applicable only in right angled triangle whereas SAS can be applicable to any given triangle.

In RHS the angle is always of measure 90º whereas in SAS the angle is always the included angle between two sides.

Hope you get it!!







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In SAS congruence, 2 sides and the included angle of a triangle are equal to corresponding parts of another triangle; the triangles can be of any type (scalene, isosceles, right angled,...) => triangles become congruent

RHS congruence is applicable only in the case of right angled triangles.  If the hypotenuse and a side of a right angled triangle are equal to corresponding sides of another right angled triangle, then the two triangles are congruent.

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