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)