# If the area of empty space enclosed by them is 150/847 square centimetre

Four equal discs are placed such that each one touches two others. If the area of empty space enclosed by them is 150/847 square centimeter, then the radius of each disc is equal to

(a) 7/6 cm

(b) 5/6 cm

(c) 1/2 cm

(d) 5/11 cm