**Question 1:**

**Fill in the blanks using correct word given in the 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)**

(i) Similar

Quadrilateral PQRS and ABCD are not similar as their corresponding sides are proportional, i.e. 1:2, but their corresponding angles are not equal.