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Vocabulary for Geometry class

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Answer
Altitude   Special segment in triangles passing through vertex, perpendicular to opposite side.  
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Bisect   To cut in to two equal parts.  
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Centroid   Point of concurrency of 3 medians in the triangle.  
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Circumcenter   Point of concurrency of 3 perpendicular bisectors in the triangle.  
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Deductive Reasoning   Reasoning process based on linking statements known to be true.  
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Inductive Reasoning   Reasoning process based on drawing a conclusion from examples.  
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Concurrent Lines   Three or more lines intersecting at a single point.  
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Collinear   Contained in the same line.  
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Polygons   Geometric figure formed by 3 or more non-intersecting sides.  
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Coplanar   Contained in the same plane.  
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Incenter   Point of concurrency of 3 angle bisectors in the triangle.  
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Construction   Creating a figure using compass and straightedge.  
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Skew   Two noncoplanar, non-parallel lines that do not intersect.  
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Theorem   A geometric principle that requires proof.  
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Undefined Terms   Point, Line, Plane.  
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Proof   A logical argument verifying the truth of a geometric principle.  
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Postulate   A geometric principle that doesn't require proof.  
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Point of Concurrency   Point where three or more lines intersect.  
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Orthocenter   Point of concurrency of 3 altitudes in the triangle.  
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Perpendicular Bisector   Special segment in triangles perpendicular to one side and bisecting that side.  
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Median   Special segment in triangles passing through a vertex and bisecting the opposite side.  
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Angle Bisector   Special segment in triangles, passing through a vertex and bisecting that angle.  
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Sine   Opposite / Hypotenuse  
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Cosine   Adjacent / Hypotenuse  
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Tangent   Opposite / Adjacent  
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Opposite Side   Side furthest away from chosen angle in a right triangle.  
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Adjacent Side   Side next to the right angle and the chosen angle in a right triangle.  
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Hypotenuse   Longest side, opposite the right angle in a right triangle.  
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Trig Ratios   Sine, Cosine, and Tangent  
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