**NCERT Solutions Maths Class 10
Exercise 6.1**

**1. Fill in the blanks 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

**2. Give two different examples of pair of:**

**(i) similar figures.**

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

**Solution: (i)** Two different examples of pair
of similar figures are:

**(a)** Any two circles

**(b)** Any two squares

**(ii)** Two different examples of pair of
non-similar figures are:

**(a)** A scalene and an equilateral triangle

**(b)** An equilateral triangle and a right-angled
triangle

**3. State whether the following quadrilaterals
are similar or not:**

**Solution:** In
the given figures, the first quadrilateral is a rhombus and the second
quadrilateral is a square. Thus, their angles are not equal.

Hence, the
quadrilaterals are not similar.