CBSE Class 10-Mathematics: Chapter –12 Areas Related to Circles Part 13
Get unlimited access to the best preparation resource for CBSE : fully solved questions with step-by-step explanation- practice your way to success.
Question 38:
The cost of fencing a circular field at the rate of per metre is . The field is to be ploughed at the rate of . Find the cost of ploughing the field.
Answer:
Since for , the length of fencing metre
for , the length fencing
Perimeter i.e., circumference of the field
Let r be the radius of the field
Area of the field
Total cost of ploughing the field = Rs.
Question 39:
Find the difference between the area of regular hexagonal plot each of whose side 72m and the area of the circular swimming take in scribed in it. (Take

Side of Hexagonal Plot
Answer:
Side of hexagonal plot Area of equilateral triangle
Area of hexagonal plot Area of triangle OAB
Area of circular region
Difference
Question 40:
In the given figure areas have been drawn of radius each with vertices A, B, C and D of quadrilateral ABCD as centers. Find the area of the shaded region.

Find the Area of the Shaded Region
Answer:
Required area Area of the circle with radius