CBSE Class 4 Maths Carts And Wheels Worksheet Set 04

Competency : Understanding Basic Concepts

Question 1. Fill in the blanks ( Hint: Circumference, diameter, radius, circle)
a. A _____ is a simple closed curve.
b. _____ is the line that runs between the circle and its centre.
c. _____ divides the circle into two equal halves.
d. _____ is the distance around the circle; it is the length of the circle.
Answer:
a. Circle
b. Radius
c. Diameter
d. Circumference
In simple words: These are the basic parts and definitions related to a circle.

Exam Tip: Memorize these fundamental definitions as they frequently appear in geometry questions.

Question 2. Name the parts of the circle given below:
O_________________
ST________________
OC________________
OT________________
Answer:
O - Centre
ST - Diameter
OC - Radius
OT - Radius
In simple words: O is the centre point, ST is the line passing through the centre, and OC and OT are lines from the centre to the boundary.

Exam Tip: Always identify the centre point first when naming parts of a circle.

Competency : Understanding Basic Concepts

Question 1. Using compass, draw circles of the given radius.
a) 3 cm
b) 4 cm
Answer:
Steps of Construction:
1. Fix the pencil firmly in the compass.
2. Place the metal tip of the compass on a ruler at the 0 cm mark.
3. Open the compass until the pencil tip is at the 3 cm mark (for part a) or 4 cm mark (for part b).
4. Mark a point on the paper as the centre O.
5. Place the metal tip on the centre O, rotate the compass 360 degrees smoothly to draw the circle.
In simple words: Open your compass to the given measurement using a scale and draw a circle around a fixed centre point.
Exam Tip: Ensure the compass screw is tight so that the radius does not change while drawing the circle.