WBBSE Solutions For Class 6 Maths Chapter 20 Geometrical Concept Of Circle

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Class 6 Math Solutions WBBSE Chapter 20 Geometrical Concept Of Circle Exercise

Question 1. From the figure, let us answer the following :

WBBSE Solutions For Class 6 Maths Chapter 20 Geometrical Concept Of Circle O Is Center Of The Circle

1. O is the _____ of the circle.
Solution: O is the centre of the circle

2. Line segment OQ is the ____ of the circle.
Solution: radius of the circle.

3. Line segment PQ is the ______ of circle.
Solution: diameter of circle.

4. Line segment OP is the _______ of circle.
Solution: Line segment OP is radius of circle.

5. Line segment MN is ______ of the circle.
Solution: Line segment MN is a chord of the circle.

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6. The points M and N have divided the circle into two _______ parts.
Solution: The points M and N have divided the circle into two arcs.

7. The area bounded by arc SR and radii SO and RO is called ______
Solution: The area bounded by the arc SR and radii SO and RO is called sector.

8. The diameter PQ has divided the circle into two equal parts which are called _____
Solution: The diameter PQ has divided the circle into two equal parts which are called semi-circles.

Class 6 Math Solutions WBBSE

Question 2. Let us write (✓) for the correct statement and (X) for the wrong one.

  1. All diameters of a circle are chords. [✓]
  2. All chords of a circle are its diameter. [X]
  3. The length of the diameter of a circle is twice the length of its radius. [✓]
  4. Sector of a circle is part of its circular area. [✓]
  5. Arc of a circle is part of the circle. [✓]
  6. Centre of the circle is a fixed point in the circle. [✓]
  7. Two diameters always intersect each of them. [✓]

Question 3. With the help of a compass and a pencil, a circle of radius 3 cm is drawn. Let’s name its centre, radius, diameter, chord, and arc.
Solution:

WBBSE Solutions For Class 6 Maths Chapter 20 Geometrical Concept Of Circle A Circle Of Radius 3 cm

  1. Centre O
  2. Radius OP
  3. Diameter AB
  4. Chord MN
  5. Arc PRB

Question 4. In this figure, let us colour the major segment yellow and minor segment green.

WBBSE Solutions For Class 6 Maths Chapter 20 Geometrical Concept Of Circle In Circel Major And Minor Segments
Solution:

  1. Major segment — yellow portion
  2. Minor segment — green portion

Class 6 Math Solutions WBBSE

Question 5. The radii of two circles are 2 cm and 4 cm respectively. Let’s write the lengths of their diameter without measuring.
Solution:

Given

The radii of two circles are 2 cm and 4 cm respectively.

⇒ Radius of 1st circle = 2 cm.

⇒ Diameter of 1st circle = 2×2 cm. = 4 cm.

⇒ Radius of 2nd circle = 4 cm.

⇒ Diameter of 2nd circle = 2 x 4cm. = 8 cm.

Question 6. If the length of the greatest chord of a circle is 10 cm, let’s write what will be the length of its radius.
Solution:

Given

If the length of the greatest chord of a circle is 10 cm

⇒ Length of the greatest chord of a circle = 100 cm.

∴ Diameter of the circle = 10 cm.

∴ Radius of the circle = 10/2 cm = 5 cm.

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