Question

Four cows are tethered at four corners of a square field of $70m$ side as shown in figure so that they can reach each other. What area of the field will remain ungraged?

• A. $5050m^2$
• B. $2050m^2$
• C. $1010m^2$
• D. $1050m^2$

Answer 1

The correct option is D $1050m^2$

Area of field ungraded $=$ Area of square field - $4$$\times$ area of 1 quadrant

$=$ $(70\times 70)$$-$$4\times \frac{90}{360}\times \frac{22}{7}\times 35\times 35$

$=$$4900-3850$

$=$ $1050$$m^2$