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Practical Geometry Class 8th Mathematics Term 3 Tamilnadu Board Solution

Class 8th Mathematics Term 3 Tamilnadu Board Solution
Exercise 4.1
  1. 4 cm and 6 cm. Draw concentric circles for the following measurements of radii.…
  2. 3.5 cm and 5.5 cm. Draw concentric circles for the following measurements of…
  3. 4.2 cm and 6.8 cm. Draw concentric circles for the following measurements of…
  4. 5 cm and 6.5 cm. Draw concentric circles for the following measurements of…
  5. 6.2 cm and 8.1 cm. Draw concentric circles for the following measurements of…
  6. 5.3 cm and 7 cm. Draw concentric circles for the following measurements of…
Exercise 4.1
Question 1.

Draw concentric circles for the following measurements of radii. Find out the width of each circular ring.

4 cm and 6 cm.


Answer:

4cm and 6cm
Steps of construction:

Step 1: Draw a rough image and mark the given measurement.



Step 2: Take any point O and mark its as centre.



Step 3: With O as centre, draw a circle of radius OA = 4cm.



Step 4: With O as centre, draw a circle of radius OB = 6cm.



Thus, the concentric circle C1 and C2 are drawn.


Width of the circular ring = OB – OA


= 6 – 4


= 2cm


Question 2.

Draw concentric circles for the following measurements of radii. Find out the width of each circular ring.

3.5 cm and 5.5 cm.


Answer:

3.5 cm and 5.5 cm

Steps of construction:


Step 1: Draw a rough image and mark the given measurement.



Step 2: Take any point O and mark it’s as centre.



Step 3: With O as centre, draw a circle of radius OA = 3.5 cm.



Step 4: With O as centre, draw a circle of radius OB = 5.5 cm.



Thus, the concentric circle C1 and C2 are drawn.


Width of the circular ring = OB – OA


= 5.5 – 3.5


= 2cm



Question 3.

Draw concentric circles for the following measurements of radii. Find out the width of each circular ring.

4.2 cm and 6.8 cm.


Answer:

4.2 cm and 6.8 cm

Steps of construction:


Step 1: Draw a rough image and mark the given measurement.



Step 2: Take any point O and mark it’s as centre.



Step 3: With O as centre, draw a circle of radius OA = 4.2 cm.



Step 4: With O as centre, draw a circle of radius OA = 6.8 cm.



Thus, the concentric circle C1 and C2 are drawn.


Width of the circular ring = OB – OA


= 6.8 – 4.2


= 2.6 cm



Question 4.

Draw concentric circles for the following measurements of radii. Find out the width of each circular ring.

5 cm and 6.5 cm.


Answer:

5cm and 6.5cm

Steps of construction:


Step 1: Draw a rough image and mark the given measurement.



Step 2: Take any point O and mark it’s as centre.



Step 3: With O as centre, draw a circle of radius OA = 5cm.



Step 4: With O as centre, draw a circle of radius OA = 6.5cm.



Thus, the concentric circle C1 and C2 are drawn.


Width of the circular ring = OB – OA


= 6.5 – 5


= 1.5 cm



Question 5.

Draw concentric circles for the following measurements of radii. Find out the width of each circular ring.

6.2 cm and 8.1 cm.


Answer:

6.2 cm and 8.1 cm

Steps of construction:


Step 1: Draw a rough image and mark the given measurement.



Step 2: Take any point O and mark it’s as centre.



Step 3: With O as centre, draw a circle of radius OA = 6.2cm.



Step 4: With O as centre, draw a circle of radius OA = 8.1cm.



Thus, the concentric circle C1 and C2 are drawn.


Width of the circular ring = OB – OA


= 8.1 – 6.2


= 1.9



Question 6.

Draw concentric circles for the following measurements of radii. Find out the width of each circular ring.

5.3 cm and 7 cm.


Answer:

5.3 cm and 7cm

Steps of construction:


Step 1: Draw a rough image and mark the given measurement.



Step 2: Take any point O and mark it’s as centre.



Step 3: With O as centre, draw a circle of radius OA = 5.3cm.



Step 4: With O as centre, draw a circle of radius OA = 7cm.



Thus, the concentric circle C1 and C2 are drawn.


Width of the circular ring = OB – OA


= 7 – 5.3


= 1.7 cm