First slide

Definition of a circle

Question

Line segments AC and BD are diameters of the circle of radius one. If $∠$ BDC = 60°, the length of line segment AB is

Moderate

Solution

$\begin{aligned} ∠ A = 60^{\circ} = ∠ D \\ AC = 2 (Given) \\ ∠ ABC = 90^{\circ} \end{aligned}$
or x=1

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