Geometry in marching band

Point
A point on a plane

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Line  
A line that is bounded by two distinct end points

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Plane
A plane is a flat, two-dimensional surface.

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Intersecting Lines
Two or more lines that meet at a point.

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Vertical Lines
A vertical line is one the goes straight up and down, parallel to the y-axis of the coordinate plane.

Horizontal line

A straight line on the coordinate plane where all points on the line have the same y-coordinate.

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Acute angle
An angle that measures less than ninety degrees but more than zero degrees

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Obtuse angle
An angle that measures more than 90 degrees but less than 180 degrees

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Right angle
An angle that bisects the angle formed by two halves of a straight line

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Square
A rectangle in which two adjacent sides have equal length.

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Rectangle
A rectangle is any quadrilateral with four right angles

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Circle
A shape with no straight lines.

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Parallel lines
Are lines in a plane which do not meet

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Triangle
Any three points, when non-collinear

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Semicircle
A semicircle is a one-dimensional locus of points that forms half of a circle.

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Cube
 A three-dimensional solid object bounded by six square faces

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Decagon
A decagon is any polygon with ten sides and ten angles.

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Hexagon
A polygon with six edges and six vertices.

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Polygon
A polygon all of whose sides are the same length and all of whose interior angles are the same measure.

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Pentagon
A pentagon is any five-sided polygon.

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Intersecting Lines
Two or more lines that meet at a point.

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Vertical angles
Have a common vertex, but they are never adjacent angles

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