MATHEMATICS CLASS 9>Chapter 21 - Area of Circles>EXERCISE-3>Q 3

MEDIUM

9th West Bengal Board

IMPORTANT

Earn 100

The area of a circular ring is $352 sq - cm$ and the radius of its outer circle is $16 cm .$ Find the radius of its inner circle in $cm$ .

50% studentsanswered this correctly

Important Questions on Area of Circles

MEDIUM

9th West Bengal Board

IMPORTANT

MATHEMATICS CLASS 9>Chapter 21 - Area of Circles>EXERCISE-3>Q 3

3.6

quintal paddy is produced in a rectangle of size

28 m \times 24 m .

In the same rate, the quantity of paddy produced in a circular field is

5280 kg .

Find the diameter of the circular field in

m

.

MEDIUM

9th West Bengal Board

IMPORTANT

MATHEMATICS CLASS 9>Chapter 21 - Area of Circles>EXERCISE-3>Q 3

There is a circular bunker around a fort. If the breadth of the bunker be

700 cm

and its area be

29.411 sq - m,

then find the area of the fort in

m^{2}

.

MEDIUM

9th West Bengal Board

IMPORTANT

MATHEMATICS CLASS 9>Chapter 21 - Area of Circles>EXERCISE-3>Q 3

The area of a circle is

616 sq - m .

Find the area and perimeter of the square inscribed in it.

MEDIUM

9th West Bengal Board

IMPORTANT

MATHEMATICS CLASS 9>Chapter 21 - Area of Circles>EXERCISE-3>Q 3

The diameter of a circular house is

62 m

and the breadth of its wall is

2 m .

Find the area of the wall in

m^{3}

.
(Write the approximate answer up to one decimal point)

MEDIUM

9th West Bengal Board

IMPORTANT

MATHEMATICS CLASS 9>Chapter 21 - Area of Circles>EXERCISE-3>Q 3

The diameter of a circular grass-field is

40 m

. There is a road of breadth

1 m

starting from

1 m

away of its end point. calculate the expenditure to grass the road at a rate of

28

paisa per sq-m.

MEDIUM

9th West Bengal Board

IMPORTANT

MATHEMATICS CLASS 9>Chapter 21 - Area of Circles>EXERCISE-3>Q 3

The length and breadth of a rectangle inscribed in a circle are

8 cm

and

6 cm

respectively. Find the area of the circle in

sq - cm

.
(Express the result in decimal form and use

π = 3.14

)

MEDIUM

9th West Bengal Board

IMPORTANT

MATHEMATICS CLASS 9>Chapter 21 - Area of Circles>EXERCISE-3>Q 3

Each of the sides of an equilateral triangle is

a cm .

Find the ratio of the areas of its circumcircle and incircle.

MEDIUM

9th West Bengal Board

IMPORTANT

MATHEMATICS CLASS 9>Chapter 21 - Area of Circles>EXERCISE-3>Q 3

The radius of the circumcircle of a right-angled triangle is $3 cm$ and the perpendicular distance of its hypotenuse from the opposite vertex is $2 cm$ . Find the area of the triangle.