Additional Questions - Chapter 4 - Geometry - Term 3 - 7th Maths Guide Samacheer Kalvi Solutions

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Additional Questions and Answers
Exercise 4.1
Question $1 .$
Give some examples of shapes with no line of symmetry.
Solution:
1. A scalene Triangle
2. The letter $F$
 

Question $2 .$
What is the order of rotational symmetry of the letter N?
Solution:
2

Exercise $4.2$
Question 1.
Construct a circle of radius $5.2 \mathrm{~cm}$ with center ' $\mathrm{O}$ '.

Solution:
Step 1: Market a point 'O'on the paper.
Step 2: Extended the compass distance equal to radius $5.2 \mathrm{~cm}$.
Step 3: At center 'O', held the compass firmly and placed the pointed end of the compass. Step 4: Slowly rotated the compass around to get the circle.
 

Question $2 .$
Draw concentric circles with radii $5.2 \mathrm{~cm}$ and $6.6 \mathrm{~cm}$. Find the width of the circular ring.
Solution:

Step 1: Drawn a rough diagram and marked the given measurements Taken any
Step 2: Take any point $O$ and marked it as the center.
Step 3: With $\mathrm{O}$ as center, drawn a circle of radius $\mathrm{OA}=5.2 \mathrm{~cm}$.
Step 4: With $\mathrm{O}$ as center, drawn a circle of radius $\mathrm{OB}=6.6 \mathrm{~cm}$. Thus the concentric circles $\mathrm{C}_{1}$ and $C_{2}$ are drawn.
Width of the circular ring $=\mathrm{OB}-\mathrm{OA}=6.6-5.2=1.4 \mathrm{~cm}$