WBBSE Solutions For Class 6 Maths Geometry Chapter 4 Geometrical Concept Of circle

Geometry Chapter 4 Geometrical Concept of Circle

Question 1. From the given following.

 

WBBSE Solutions For Class 6 Maths Geometry Chapter 4 Geometrical Concept Of circle Question 1

 

1 . O is of the circle.

Solution: Centre.


2. OA is an off-the-circle.

Solution: Radius

WBBSE Class 6 Circle Concepts Notes


3. AB is an off-the-circle.

Solution: Diameter

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4. PR is an off-the-circle.

Solution: Chord


5. MN is an off-the-circle.

Solution: arc


6. The shaded region COD is a circle.

Solution:  Sector

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7. \(\overparen{P Q R}\) is a of the circle.

Solution: minor arc

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8. PACDMNBR is an off-the-circle.

Solution: major arc


9. APQRB is of the circle.

Solution: semi-circle


10. AB = 2 x ? or 2 x ?

Solution: OA or OB.

Short Questions on Circle Geometry

Question 2. The radius of a circle is 2*5 cm, what is the diameter of the circle?

Solution:

Given:

The radius of a circle is 2*5 cm

The diameter of the circle = 2 x the radius of the circle

= (2 x 2-5) cm

= 5 cm.

The diameter of the circle is 5 cm

WBBSE Solutions For Class 6 Maths Geometry Chapter 4 Geometrical Concept Of circle

Common Questions About Parts of a Circle

Question 3. The diameter of a circle is 21 cm, What is the radius of the circle?

Solution:

Given:

The diameter of a circle is 21 cm

The radius of the circle = 1/2 x the diameter of the circle

= \(\left(\frac{1}{2} \times 21\right)\) cm

= 10.5 cm

The radius of the circle is 10.5 cm

Practice Problems on Circles

Question 4. The radius of a circle is 14 cm, what is the circumference of the circle?

Solution:

Given:

The radius of a circle is 14 cm

The circumference of the circle

= 2πr, (r = radius)

=\(\left(2 \times \frac{22}{7} \times 14\right)\) cm

= 88 cm.

The circumference of the circle is 88 cm

Examples of Real-Life Applications of Circles

Question 5. The radius of a semi-circle is 7 cm, what is the circumference of the semi-circle?

Solution:

Given:

The radius of a semi-circle is 7 cm

The circumference of the semi-circle

= (πr + 2r), r = radius of semi-circle.

= \(\left(\frac{22}{7} \times 7+2 \times 7\right)\) cm

= (22 + 14) cm

= 36 cm.

The circumference of the semi-circle is 36 cm

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