MEDIUM
7th CBSE
IMPORTANT
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A rhombus has the same perimeter as the circumference of a circle. If the side of the rhombus is 2.2 m, find the radius of the circle (in m). Write your answer in one decimal place.

(Use: π=227 ).

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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 14
A wire is looped in the form of a circle of radius 28 cm. It is re-bent into a square form. Determine the length of the side of the square (in cm). (use π=227 ).
MEDIUM
7th CBSE
IMPORTANT
Mathematics for Class 7>Chapter 21 - Mensuration – II (Area of Circle)>EXERCISE>Q 15
 A bicycle wheel makes 5000 revolutions in moving 11 km. Find the diameter of the wheel (in cm).  (use: π=227 ).
MEDIUM
7th CBSE
IMPORTANT
Mathematics for Class 7>Chapter 21 - Mensuration – II (Area of Circle)>EXERCISE>Q 16
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=227 ). Write your answer in two decimal places.
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=227 ).
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=227 ).
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=227 )
MEDIUM
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 3m 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 7cm is k cm2  (use: π=227 ). Find k.