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Four horses are be tethered at four concern of a square plot of side 63 meters, so that they just cannot reach one another. The area left ungrazed is?

675.5 m2
780.6 m2
785.8 m2
850.5 m2

Correct Answer: 850.5 m2

Explanation:

Area left ungrazed
= [(63 x 63) - (4 x 1/4 x 22/7 x (63/2)²] m²
= (63 x 63 - (99 x 63)/2 ) m²
= 63 x (63 - 99/2) m²
= 850.5 m²

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