One of the important question for the board exam class 10 from
mensuration chapter.This question is from r d sharma class 10 maths.
chapter-15.4 question number-7 maths r d sharma,mensuration.
In this question we have to find the area of the field in which the
cow can graze given that a cow is tied with a rope of length 14 m at
the corner of a rectangle field of dimensions 20 m x 16 m.
The dotted portion indicated the area over which the cow can graze.
It’s clearly seen that, the shaded area is the area of a quadrant of a circle of radius equal to the length of the rope.
Thus, the required area = ¼ x πr2
= ¼ x 22/7 x 14 x 14
= 154
Hence, the area of the field in which the cow can graze is 154 cm2