Asector is a wedge-shaped section of a circle graph.

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True. Draw two lines from the center of the circle that intersect the circumference, the sector is the area comprised between the two lines and the arc of the circumference between them.
 

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.