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

Anurag Mishra Professor Asked on 20th February 2016 in Maths.
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    Answer: (b) 5/6 cm

    Anurag Mishra Professor Answered on 20th February 2016.
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