Mathematics for Class 7>Chapter 21 - Mensuration – II (Area of Circle)>EXERCISE>Q 16

MEDIUM

7th CBSE

IMPORTANT

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A boy is cycling such that the wheels of the cycle are making $140$ revolutions per minute. If the diameter of the wheel is $60 cm$ , calculate the speed in $km$ per hour with which the boy is cycling. (use: $π = \frac{22}{7}$ ). Write your answer in two decimal places.

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Important Questions on Mensuration – II (Area of Circle)

MEDIUM

7th CBSE

IMPORTANT

Mathematics for Class 7>Chapter 21 - Mensuration – II (Area of Circle)>EXERCISE>Q 17

The diameter of the driving wheel of a bus is

140 cm

. How many revolutions per minute must the wheel make in order to keep a speed of

66 km

per hour? (use:

π = \frac{22}{7}

).

EASY

7th CBSE

IMPORTANT

Mathematics for Class 7>Chapter 21 - Mensuration – II (Area of Circle)>EXERCISE>Q 18

A water sprinkler in a lawn sprays water as far as

7 m

in all directions. If the length of the outer edge of wet grass is

k m

, find

k

. (use:

π = \frac{22}{7}

).

MEDIUM

7th CBSE

IMPORTANT

Mathematics for Class 7>Chapter 21 - Mensuration – II (Area of Circle)>EXERCISE>Q 19

A well of diameter

150 cm

has a stone parapet around it. If the length of the outer edge of the parapet is

660 cm

, then find the width of the parapet (in

cm

). (use:

π = \frac{22}{7}

)

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7th CBSE

IMPORTANT

Mathematics for Class 7>Chapter 21 - Mensuration – II (Area of Circle)>EXERCISE>Q 20

An Ox in a kolhu (an oil processing apparatus) is tethered to a rope

3 m

long. If the distance covered in

14

rounds is

k m

, find

k

.

EASY

7th CBSE

IMPORTANT

Mathematics for Class 7>Chapter 21 - Mensuration – II (Area of Circle)>EXERCISE>Q 1

The area of the circle whose radius is

7 cm

is

k {cm}^{2}

(use:

π = \frac{22}{7}

). Find

k

.

EASY

7th CBSE

IMPORTANT

Mathematics for Class 7>Chapter 21 - Mensuration – II (Area of Circle)>EXERCISE>Q 1

The area of the circle whose radius is

2 .1 m

is

k m^{2}

. (use:

π = \frac{22}{7}

). Find

k

up to two decimal places.

EASY

7th CBSE

IMPORTANT

Mathematics for Class 7>Chapter 21 - Mensuration – II (Area of Circle)>EXERCISE>Q 1

If the area of the circle of radius

7 km

is

a {km}^{2}

, then find

a

. (use:

π = \frac{22}{7}

).

EASY

7th CBSE

IMPORTANT

Mathematics for Class 7>Chapter 21 - Mensuration – II (Area of Circle)>EXERCISE>Q 2

The area of the circle whose diameter is

8 .4 cm

is

k {cm}^{2}

( use:

π = \frac{22}{7}

). Find

k

up to two decimal places.