In the accompanying diagram of circle o, diameter AB is perpendicular to chord CD and intersects C Dat E, CD = 12 and AB = 20.
What is the length of OE?

Please answer ASAP

How do you solve a question like this?

Which of the following would be a reasonable estimate for the weight of a pencil? a. 1 × 10^-20 lb b. 1 × 10^20 lb c. 1 × 10^2 lb d. 1 × 10^-2 lb

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