Probability on an annular target

Probability on an annular target

Secondary 2
2 marks
TGM Original Questions

Core stretch

Assume the landing point is uniformly distributed over the whole board.

A dart lands at random on the circular board shown. The outer radius is 10 cm and the unshaded inner radius is 4 cm. Find the probability that the dart lands in the shaded annulus.[2]

Solution:

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Answer:\(\frac{21}{25}\).

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