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Exercise - 6.1

Triangles

**Question-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)

(i) Similar (ii) Similar (iii) Equilateral (iv) (a) Equal (b) Proportional

**Question-2 :-** Give two different examples of pair of

(i) similar figures.

(ii) non-similar figures.

(i) (a)Two Equilateral triangles with sides 1 cm and 2 cm (b)Two Squares with sides 1 cm and 2 cm

(ii) (a)Trapezium & Square (b)Triangle and Paralleogram

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

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

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