A circular path lies between circles of radii 15 m and 13 m. Its area pi R^2 - pi r^2 equals:

  1. 4pi m²
  2. 212pi m²
  3. 59pi m²
  4. 56pi m²
Answer

D) 56pi m²

pi(R^2 - r^2) = pi(R + r)(R - r) = pi(28)(2) = 56pi m². SLO M-09-A-21 · Application

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