PERIMETER AND AREA OF CIRCLE

PERIMETER AND AREA OF CIRCLE

by Ajay Prasad

​EXERCISE 11.3

​Q. No. 10 From a circular card sheet of radius 14 cm, two circles of radius 3.5 cm and a rectangle of length 3 cm and breadth 1cm are removed. (as shown in the adjoining figure). Find the area of the remaining sheet. (Take π = 22/7 )

Fill in the Blanks

Area of the remaining card (shaded region) = Area of circle - (2 X Area of smaller circle + Area of ---------------)

​

​EXERCISE 11.3

Q. No. 11 ​A circle of radius 2 cm is cut out from a square piece of an aluminium sheet of side 6 cm. What is the area of the left over aluminium sheet? (Take π = 3.14)

​Solution Q. 11

​EXERCISE 11.3

Q. No. 12 The circumference of a circle is 31.4 cm. Find the radius and the area of the circle? (Take π = 3.14)​

​EXERCISE 11.3

​Q.No. 13 A circular flower bed is surrounded by a path 4 m wide. The diameter of the flower bed is 66 m. What is the area of this path? (π = 3.14)

Poll

What is the area of the path

• Area of Bigger Circle - Area of Smaller Circle

• Area of Circle

• Area of Bigger Circle

• Area of Smaller Circle

​Solution Q. 13

​​EXERCISE 11.3

Poll

How to check whether the sprinkler water the circular flower park

• Find the radius of the park and find the area of the sprinkler and compare

• Find the radius of the park and compare the radius with sprinkler

• Find the area of sprinkler and compare with the area given of the circular park

​EXERCISE 11.3

​Q.No. 15 Find the circumference of the inner and the outer circles, shown in the adjoining figure? (Take π = 3.14)

Poll

What is the formula to be used for solving the problem

• $$\pi r^2\ and\ \pi R^2$$  

• $$2\pi R^2\ and\ 2\pi r^2$$  

• $$2\pi R\ and\ 2\pi r$$  

​​EXERCISE 11.3

​​EXERCISE 11.3

​Q.No.17 The minute hand of a circular clock is 15 cm long. How far does the tip of the minute hand move in 1 hour. (Take π = 3.14)

Multiple Choice

The area of the minute hand

• $$2\pi r$$  

• $$\pi r^2$$  

• can not say

​THANK YOU