# NCERT Class 7 Mathematics Solutions: Chapter 7 –Congruence of Triangles Exercise 7.2 Part 1

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1. Which congruence criterion do you use in the following?

Answer:

(a)

Given,

So,

(b)

Given,

So,

(C)

Given,

So,

(d)

Given,

So,

Answer:

(a) By SSS congruence criterion,

Since it is given that

The three sides of one triangle are equal to the three corresponding sides of another triangle.

So,

(b) By SAS congruence criterion,

Since it is given that and

The two sides and one angle in one of the triangle are equal to the corresponding sides and the angle of other triangle.

So,

(c) By ASA congruence criterion,

Since it is given that ,

The two angles and one side in one of the triangle are equal to the corresponding angles and side of other triangle.

So,

(d) By RHS congruence criterion,

Since it is given that

Hypotenuse and one side of a right angled triangle are respectively equal to the hypotenuse and one side of another right angled triangle.

So,