michaelkalend wrote:
Bunuel wrote:
In the circle above, CD is parallel to diameter AB and AB has length 16. What is the length of arc DB?
(A) 2π
(B) 7π3
(C) 2π3
(D) 4π3
(E) 8π3
Since CD is parallel to diameter AB, then <BCD=<ABC=30.
Next,Central Angle Theorem states that the measure of inscribed angle is always half the measure of the central angle .
Consider, O to be the center of the circle, then according to the central angle theorem
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