Four horses are tethered at 4 corners of a square field of side 70 metres so that they just cannot reach one another. The area left ungrazed by the horses is:	Choose the correct answer
A) 1050 sq.m	B) 3850 sq.m	C) 950 sq.m	D) 1075 sq.m	E) 1065 sq.m
area ungrazed is given by   total area - 4*area grazed by each horse   = 70*70 - 4*(90/360)*pi*(70/2)^2   as the angle made by the horse is 90 degree, so applying the area of the sector,= theta/360*pi*radius^2 above   = 70*70 - pi*(70/2)*(70/2)   = 70*70 { 1- pi/4}   = 70*70{6/(7*4)} , expanding pi = 22/7   = (70*70*6) / (7*4)= 
<gadget id="calculator">(70*70*6) / (7*4)</gadget>
<output>1_050</output>
1050 sq m   1050 sq.mNSWER:1050 sq.m
<result>A</result>
Four horses are tethered at 4 corners of a square field of side 70 metres so that they just cannot reach one another. The area left ungrazed by the horses is: