### Access Answers to NCERT Class 7 Maths Chapter 7 – Congruence of Triangles Exercise 7.1

**1. Complete the following statements:**

**(a) Two line segments are congruent if ___________.**

**Solution:-**

Two line segments are congruent if they have the same length.

**(b) Among two congruent angles, one has a measure of 70 ^{o}; the measure of the other angle is ___________.**

**Solution:-**

Among two congruent angles, one has a measure of 70^{o}; the measure of the other angle is 70^{o}.

Because, if two angles have the same measure, they are congruent. Also, if two angles are congruent, their measure are same.

**(c) When we write ∠A = ∠B, we actually mean .**

**Solution:-**

When we write ∠A = ∠B, we actually mean m ∠A = m ∠B.

**2. Give any two real-life examples for congruent shapes.**

**Solution:-**

The two real-life example for congruent shapes are,

(i) Fan feathers of same brand.

(ii) Size of chocolate in the same brand.

(iii) Size of pens in the same brand

**3. If ΔABC ≅ ΔFED under the correspondence ABC ↔ FED, write all the corresponding congruent parts of the triangles.**

**Solution:-**

Two triangles are congruent if pairs of corresponding sides and corresponding angles are equal.

All the corresponding congruent parts of the triangles are,

∠A ↔ ∠F, ∠B ↔ ∠E, ∠C ↔ ∠D

Correspondence between sides:

**4. If ΔDEF ≅ ΔBCA, write the part(s) of ΔBCA that correspond to**

**(i) ∠E (ii) (iii) ∠F (iv) **

**Solution:-**

From above the figure we can say that,

The part(s) of ΔBCA that correspond to,

(i) ∠E ↔ ∠C

(ii)

(iii) ∠F ↔ ∠A

(iv)

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