# Geometry and Angles

### By Larissa Wratney

## 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: T**he 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.

**Non-Adjacent: **Not **adjacent **or not next to.

**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

## Acute Angles These angles are more than 0 degrees and less than 90 degrees. | ## Right Angles These angles are exactly 90 degrees. | ## Obtuse Angles These angles are between 91 and 179 degrees. |

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