State whether the following quadrilaterals are similar or not

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)

Give two different examples of pair of

(i) Similar figures

(ii) Non-similar figures

State whether the following quadrilaterals are similar or not