# Triangles : Exercise - 6.1 (Mathematics NCERT Class 10th) Q.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)

Sol.

(i) similar
(ii) similar
(iii) equilateral
(iv) equal, proportional

Q.2      Give two different examples of pair of
(i) similar figures
(ii) non-similar figures.

Sol.

(i) Two different examples of pair of similar figures are :
(a) any two rectangles (b) any two squares
(ii) Two different examples of pair of non-similar figures are :
(a) a scelene and an equilateral triangle.
(b) an equilateral triangle and a right angle triangle

Q.3       State whether the following quadrilaterals are similar or not : Sol.          On looking at the given figures of the quadrilaterals, we can say that they are not similar.

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