On the corners of a square field of side 14 metres, 4 horses are tethered in such a way the adjacent horses just reach each other. There is a circular pond of area 20 sq.m. in the centre of the square. What is the area left ungrazed?
Explanation:
Side of square field = 14 m
∴ Area of square field = 196 sq.m.
Area of the circle = 20 sq.m.
Area grazed by horses = 4×90°360° × π × 72
= 22 × 7
= 154 sq.m.
∴ Area capable of being grazed = 196 – 20 = 176 sq.m.
∴ Area left ungrazed = 176 – 154 = 22 sq.m.
Hence, option (b).
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