OP Malhotra S.Chand ICSE Class 9 Mathematics Solutions for Chapter 17 Circle – Circumference and Area

This post is dedicated to all the ICSE Class 9 students for the Solutions of OP Malhotra S.Chand Class 9 ICSE Mathematics, Chapter 17 Circle – Circumference and Area.

**Chapter 17 – Circle – Circumference and Area**

**Circle – Circumferences and Area – Exercise 17 (A) all Questions Solution**

Find the circumference of the circles whose diameters are 49 cm

Find the circumference of the circles whose diameters are 14 cm

Find the circumference of the circles whose diameter is 9.8 cm

Find the circumference of the circle whose diameter is 7 cm

Find the circumference of the circles whose diameters are :

(i) 49 cm

(ii) 14 cm

(iii) 9.8 cm

(iv) 7 cm

Find the circumference of the circle whose radii is 7 cm

Find the circumference of the circle whose radii is 28 cm

Find the circumference of the circle whose radii is 3.5 cm

Find the circumference of the circle whose radii is 98 m

Find the circumference of the circle, if radius = 4.5 cm

Find the circumference of the circle, if diameter = 15 cm

Find the length of the diameter of the circle whose circumference is 22 cm

Find the length of the diameter of the circle whose circumference is 8.8 cm

Find the length of the diameter of the circle whose circumference is 44 cm

Find the length of the radii of the circle whose circumference is 55 cm

Find the length of the radii of the circle whose circumference is 13.2 m

Find the length of the radii of the circle whose circumference is 440 m

Find the radii of the circle if circumference is 100 m

Find the radii of the circle if circumference is 6.4 dm

The diameter of Venus planet is 12,278 km. Find its circumference

Find the perimeter of semi-circular plate of radius 3.85 cm

The circumference of a circle exceeds the diameter by 16.8 cm. Find the radius of the circle. (Take π = 22/7)

A wire is in the form of a circle of radius 42 cm. It is bent into a square. Determine the side of the square

In Fig. 17.05, the radius is 3.5 cm. Find the perimeter of the quarter of the circle correct to one decimal place

The inner circumference of a circular track is 440 m. The track is 14 m wide. Find the diameter of the outer circle of the track. (Take л = 22/7)

The inner edge of a circular running-track is 440 m long. If the track is 10 m wide, find the length of the outer edge of the track

A garden roller has a circumference of 3 metres. How many revolutions does it make in moving a distance of 21 metres

A bicycle wheel, diameter 70 cm, is making 25 revolutions in 10 sec. At what speed in km/h is the bicycle travelling

A small cart is being driven at 10 km per hour. If each wheel is 91 cm in diameter, find the number of revolutions made by each wheel per minute

How long will a boy take to go four times round a circular field whose radius is 35 m, walking at 5 km per hour

A wheel of a cart is making 4 revolutions per second. If the diameter of the wheel is 84 cm, find its speed

Fig. 17.07 shows a running track in which AF = CD = 100 m and FED and ABC are semi circles whose diameters FD and AC are equal. How much will an athlete run in taking one complete round of the track

**Circle – Circumference and Area – Exercise 17 (B) all Questions Solution**

Find the area of the circles whose

Find the area of the circle whose diameter = 7 cm

Find the area of the circle whose radius = 14 cm

Find the area of the circle whose diameter is 2.8 cm

A horse is tied to a pole with 28 m long string. Find out the area which the horse can graze

Find the radius of a circular field whose area is 154 cm2

Find the radius of a circular field whose area is 1386 cm²

The area of a circle is 24.64 cm². Find its circumference

A copper wire, when bent in the form of a square, encloses an area of 121 cm^{2}. If the same wire is bent into the form of a circle, find the area of the circle

The circumference of a circle is equal to the perimeter of a square. The area of the square is 484 sq m. Find the area of the circle. (Assume π = 22/7)

A wire is in the form of a circle of radius 42 cm. It is bent into a square. Determine the area of the square and compare the areas of the regions enclosed in the two cases. (Use π = 22/7)

From a copper plate, which is a square of side 12.5 cm, a circular disc of diameter 7 cm is cut off. Find the weight of the remaining part, if 1 sq cm of the plate weighs 0.8 g. (Assume π = 22/7)

The circumference of two circles are in the ratio 2 : 3. Find the ratio of their

A square park has each side of 100 m. At each corner of the park, there is a flower bed in the form of a quadrant of radius 14 m as shown in the figure. Find the area of the remaining part of the park

The radius of a circular field is 20 m. Inside it runs a path 5 m wide all around. Find the area of the path

A road 3.5 m wide surrounds a circular plot whose circumference is 44 m. Find the cost of paving the road at Rs 10 per m2

A lawn is in the shape of a semi-circle of diameter 35 dm. The lawn is surrounded by a flower bed of width 3.5 dm all round. Find the area of the flower bed in dm2

A circular field has a perimeter of 650 m. A plot, in the shape of a square having its vertices on the circumference of the field, is marked in the field. Calculate the area of the square plot

The shaded area in Fig. 17.19 between the circumferences of two concentric circles is 346.5 cm2. The circumference of the inner circle is 88 cm. Calculate the radius of the outer circle