CBSE Class 10-Mathematics: Chapter –12 Areas Related to Circles Part 16
Get unlimited access to the best preparation resource for CBSE : fully solved questions with step-by-step explanation- practice your way to success.
Question 2:
The length of the minute hand of a clock is . Find the area swept by the minute hand in minutes.
Answer:
Angle covered by minute hand in minutes
Angle covered in 1 minute
Angle covered in 5 minute
We know that area swept by the minute hand during this period
Area of sector with sector angle
Question 3:
An umbrella has 8 ribs which are equally spaced as given in the figure. Assuming umbrella to be a flat circle of radius . Find the area between two consecutive ribs of the umbrella.

Two Consecutive Ribs of the Umbrella
Answer:
Area between two consecutive ribs of the umbrella
Area of the sector with angle made at centre
Question 4:
Find the area of the shaded region if , and is the centre of the circle.

Find the Area of the Shaded Region
Answer:
Area of the shaded region
Area of the semi-circle with as centre and as radius – area of
Since QR is a diameter passing through the center O of the circle
Diameter of the circle
And
Area of the semicircle
Also, area of
Hence, area of the shaded region