# Ex.6.1 Q1 Triangles Solution - NCERT Maths Class 10

Go back to  'Ex.6.1'

## Question

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)

Video Solution
Triangles
Ex 6.1 | Question 1

## Text Solution

(i) All circles are Similar. (congruent, similar)

Reasoning:

As we know that two similar figures have the same shape but not necessarily the same size. (Same size means radii of the circles are equal)

Steps:

Similar. Since the radii of all the circles are not equal.

(ii) All squares are Similar. (similar, congruent)

Reasoning:

As we know that two similar figures have the same shape but not necessarily the same size(same size means sides of the squares are equal.)

Steps:

Similar. Since the sides of the squares are not given equal.

(iii) All Equilateral. triangles are similar. (isosceles, equilateral)

Reasoning:

Anequilateral triangle has equal sides and equal angles.

Steps:

Equilateral. Each angle inan equilateral triangle is $${{60}^{{}^\circ }}$$.

(iv) Two polygons of the same number of sides are similar, if (a) their corresponding angles are Equal and (b) their corresponding sides are Proportional (equal, proportional).

Reasoning:

As we know that two polygons of same number of slides are similar if their corresponding angles are equal and all the corresponding sides are in the same ratio or proportion.

Steps:

(a) Since the polygons have same number of sides, we can find each angle using formula \begin{align}\left( {\frac{{2n - 4}}{n}} \right)\end{align} right angles. Here $$‘n’$$ is number of sides of a polygon.

(b) We can verify by comparing corresponding sides.

Learn from the best math teachers and top your exams

• Live one on one classroom and doubt clearing
• Practice worksheets in and after class for conceptual clarity
• Personalized curriculum to keep up with school