(Answered) My uncle plays darts on a circular dart board of radius 20

Statistics

My uncle plays darts on a circular dart board of radius 20 cm. He assumes a dart lands anywhere on the board with equal probability.

a) What is the probability that his dart lands less than 5 cm from the centre of the board?

b) That his dart lands exactly 5 cm from the centre?

c) My uncle wants to divide his board into ten "doughnuts" defined by circles of radii r0

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