Practical Geometry
Class 8th Mathematics Term 3 Tamilnadu Board Solution
- 4 cm and 6 cm. Draw concentric circles for the following measurements of radii.…
- 3.5 cm and 5.5 cm. Draw concentric circles for the following measurements of…
- 4.2 cm and 6.8 cm. Draw concentric circles for the following measurements of…
- 5 cm and 6.5 cm. Draw concentric circles for the following measurements of…
- 6.2 cm and 8.1 cm. Draw concentric circles for the following measurements of…
- 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