Concentric-circle probability equation

Concentric-circle probability equation

Secondary 2
TGM Original Questions

A dartboard has three concentric circles A, B and C with radii 3 cm, \(x\) cm and \(x+3\) cm.

  1. Write the area of circle B.
  2. The probability of landing inside B but outside A is \(1/3\). Find \(x\).
  3. Hence find the ratio of the three radii.

Solution:

Solution locked

Sign in to view the step-by-step solution

Similar questions are unavailable for this question.
Answer:(i) \(\pi x^2\); (ii) \(x=6\); (iii) \(1:2:3\).

Need help? Join our JC Math tuition classes.

Learn more