# Geometry and Angles

## Geometry Terms (Explained)

Adjacent Angles: Two angles in a plane which share a common vertex and a common side but do not overlap.

Angles: To rays sharing a common endpoint.

Complimentary Angles: Two angles that add up to 90 degrees.

Congruent: Exactly the same in size and shape.

Corresponding: Two features that are situated the same way in different objects.

Degrees: The unit of measurement used to measure angles.

Flip: See Reflection

Geometry: The study of geometric figures.

Glide Reflection: A combination of a reflection and a translation.

Line: The straight path connecting two points and extending for ever.

Line Segment: A part of a line.

Midpoint: The halfway point between a given set of points.

Number Line: A line presenting integers in numerical order.

Parallel Lines: Two lines that never intersect.

Parallel Planes: Two planes that never intersect.

Parallelogram: A quadrilateral with two pairs of parallel sides.

Perimeter: The distance around the outside of a figure.

Perpendicular: Intersecting Lines that form a 90 degree angle.

Ray: A part of a line starting at a specific point and extending infinitely in one direction.

Reflection: A transformation in which a figure is reflected across a line.

Rotation: A transformation in which a plane figure turns around a fixed point (like pivoting for you basketball fans).

Similar: Identical in shape, although not necessarily the same size.

Slide: See Translation.

Supplementary Angles: Two angles that add up to 180 degrees.

Translation: A transformation in which a figure is picked up and moved to another location without changing the figure.

Turn: See Rotation

For more definitions, check out Mathwords: Index for Geometry

## Straight Angles

One of the most important angles. A straight line, exactly 180 degrees.

## Math is Fun - Geometry / Math - homework help - Geometry

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