four horses are tethered at four corners of a square plot of side 63 metres so that they just can not reach one another . the area left ungrazed is :
required area = ( 63 * 63 – 4 * 1 / 4 * 22 / 7 * 63 / 2 * 63 / 2 ) = 850.5 m 2 answer : d
subtract(multiply(63, 63), multiply(multiply(multiply(multiply(const_4, const_0_25), const_pi), divide(63, const_2)), divide(63, const_2)))