# Geometry

### 35 terms by FairiesRVD

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### point

This marks and exact location in space.

### line

An endless straight path. Has no end points

### ray

Part of line that goes on forever in one direction. Has one end point.

### line segment

Part of a line between two end points.

### plane

An endless flat surgace. Named by three points.

### angle

Formed by two rays with the same endpoint (vertex).

### right angle

An angle that measures 90 degrees.

### acute angle

An angle that measures less than 90 degrees.

### obtuse angle

An angle that measures more than 90 degress.

### straight angle

An angle that measures 180 degrees.

### parallel lines

Lines, in the same plane, that never intersect.

### Intersecting lines

Lines that cross at one point.

### perpendicular lines

Lines that intersect at right angles.

### polygon

A closed, plane (flat) figure, formed by three or more line segments.

### regular polygon

A polygon that has sides of equal measure, and has angles of equal measure.

### Triangle

3 sides, 3 angles

4 sides, 4 angles

### pentagon

5 sides, 5 angles

### hexagon

6 sides, 6 angles

### octagon

8 sides, 8 angles

### Congruent

Figures that have the same size and shape.

### Similar

Figures that have the same shape, but different sizes.

### Line of Symmetry

A line that divides a figure into two congruent parts.

### Polyhedron

A solid figure with faces that are polygons.

### prism

A polyhedron that has two congruent (exactly the same) bases.

### pyramid

A polyhedron with only one base.

### Edge

Line where two faces come together.

### Faces

The flat surfaces of solid figures

### Vertex (plural - verteces)

The point where several edges come together.

### Transformation

Movement of a figure that does not change it's size or shape.

### translation

Sliding of a figure in a straight line. The figure does not change direction.

### hudjw

Flipping a figure over a line (mirror). Figure is now in the opposite direction.

### Rotation

Turning a figure around a point (vertex). Placing your finger on one corner of the figure, and turing the object around your finger.

Example: