Definitions/Vocabulary, Formulas

Angle - The union of two rays that have the same end point. 

 

•      Acute - An angle whose degree measure is greater than 0 and less than 90. 

•      Obtuse - An angle whose degree measure is greater is than 90 and less than 180. 

•      Right - An angle whose degree measure is 90. 

•      Straight - has a measure of 180°; it looks just like a line.

•      Complementary - Two angles whose measures add up to 90. 

•      Supplementary - Two angles whose measures add up to 180. 

 

 

 

Chord - a segment whose end points are on the circle.

 

Radius - a line segment whose end pints are the center of the circle and any point on the circle. (Plural: radii)

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Circle - the set of all points in a plane at a fixed distance from a given point called the center.  The fixed distance is called the radius of the circle.  An equation of a circle with center at point (h,K) and radius leng r is, (x-h)((x-h) +  (y-k) (y-k)  = (r)(r)

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Diameter - A chord of the circle that contains the center of the circle.

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Secant - A line that intersects the circle in two different points

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Tangent - A line that intersects the circle in exactly one point, called the point of tangency.

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Formula for Areas, Volume, Perimeter

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