# 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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