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2005 AMC 12A Question 15

AMC12 · 2005 AMC 12A

Question 15

Let $AB$ be a diameter of a circle and $C$ be a point on $AB$ with $2 \cdot AC = BC.$ Let $D$ and $E$ be points on the circle such that $DC \perp AB$ and $DE$ is a second diameter. What is the ratio of the area of $\triangle DCE$ to the area of $\triangle ABD?$

Question illustration
  1. $\dfrac{1}{6}$
  2. $\dfrac{1}{4}$
  3. $\dfrac{1}{3}$
  4. $\dfrac{1}{2}$
  5. $\dfrac{2}{3}$