Congruence of Triangles - Solutions 1

CBSE Class –VII Mathematics
NCERT Solutions
Chapter 7 Congruence of Triangles
 (Ex. 7.1)

Question 1. Complete the following statements:
  1. Two line segments are congruent if _______________.
  2. Among two congruent angles, one has a measure of 70, the measure of other angle is _______________.
  3. When we write A = B, we actually mean _______________.
Answer: (a) they have the same length
(b) 70
(c) mA = mB
Question 2. Give any two real time examples for congruent shapes.
Answer: (i) Two footballs
(ii) Two teacher’s tables
Question 3. If ΔABC ΔFED under the correspondence ABC  FED, write all the corresponding congruent parts of the triangles.
Answer: Given: ΔABC ΔFED.

The corresponding congruent parts of the triangles are:
(i) F
(ii) E
(iii) D
(iv) AB¯FE¯
(v) BC¯ED¯
(vi) AC¯FD¯
Question 4. If ΔDEF ΔBCA, write the part(s) of ΔBCA that correspond to:
Answer: Given: ΔDEF ΔBCA.

(i) C
(ii) EF¯CA¯
(iii) A
(iv) DF¯