# CLASS 10 MATH NCERT SOLUTIONS FOR CHAPTER – 6 Triangles Ex – 6.1

## Triangles

Question 1.
Fill in the blanks by using the correct word given in brackets.

(i) All circles are…………….. (congruent/similar)
(ii) All squares are……………. (similar/congruent)
(iii) All …………….. triangles are similar. (isosceles/equilateral)
(iv) Two polygons of the same number of sides are similar, if
(a) their corresponding angles are …………… and
(b) their corresponding sides are …………… (equal/proportional)

Solution:
(i) similar.
(ii)  similar.
(iii)  equilateral
(iv) equal, proportional

Question 2.
Give two different examples of pair of

(i) similar figures.
(ii) non-similar figures.

Solution:

(i) Similar figures:
A pair of equilateral triangles of different side lengths, a pair of two rectabgles of different lengths and breadths, etc.

(ii) Non-similar figures:
A pair of a rectangle and a parallelogram with angles not equal to 90°, a pair of an isosceles triangle and a scalene triangle, etc.

Question 3.
State whether the following quadrilaterals are similar or not.

Solution:

The given quadrilaterals are not similar, because their corresponding angles are not equal.