Mensuration Practice Test 7

A goat is tethered to one end of a rope of length of 20 m, while the other end is fixed at the centre of a large circular field. There is a square-shaped elevated platform with sides of 10 m on the field such that one corner of the elevated square platform coincides with the centre of the circular field. If the goat is unable to mount the square-shaped elevated platform, what is the total area that the goat will be able to graze?