Tuesday, March 31, 2015

So what is Geometry anyway?

Geometry is the study of the relations of points, lines, surfaces, solids, and higher dimensional analogs.

Key terms to know: 
Line- no thickness, and extends forever in two directions and determined by two unique points.

Collinear points- Points on the same line. 
 

Line Segment- subset of a line, containing two points of the line and all the points between those two points. 


Ray- subset of a line. 


Intersecting lines- lines with exactly one point in common. 


Parallel lines- coplanar that have no points in common.


Angles- formed by two rays with the same end points.
 

Vertex- common endpoint of two rays that form an angle. 


Adjacent angles- angles that share a common side and vertex, but without overlapping interiors.


Polygon- a simple closed curve with sides that are line segments. 


Triangles- a shape that ALWAYS adds up to 180 degrees.


Quadrilateral- a shape that its angles ALWAYS add up to 360 degrees.

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