# Geometry Dictionary

### 41 terms by BonhommeNarchel

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A slide

A turn

A flip

### A plane

Flat surface extending forever in all directions

### A line

Straight path that extends forever in both directions

### Line segment

Straight path between two endpoints

### A angle

A figure formed by two rays that begin at the same point

End point

### A point

Exact location in space

### Polygon

Closed figure formed by line segments joined only a their endpoints

### Parallel lines

Lines that do not cross

### Perpendicular lines

Lines that cross at 90 degree angle

### Hexagon

Polygon with six sides

### Octagon

Polygon with eight sides

### Decagon

Polygon with ten sides

### Right angle

Angle that is 90 degrees

### Regular polygon

All sides congruent and all angles congruent

### Diagonal

A line segment that joins two vertices of a polygon but it not a side

### Obtuse angle

Greater than 90 degrees and less than 180 degrees

### Acute angle

Angle less than 90 degrees

### Nonagon

Polygon with nine sides

### Heptagon

Polygon with seven sides

### Pentagon

Polygon with five sides

### Equilateral triangle

Three sides that have the same length

### Isosceles triangle

Two sides that have the same length

### Scalene triangle

No sides that have the same length

### Acute triangle

Less than 90 degrees

90 degrees angle

### Obtuse triangle

Greater than 90 degrees

### Trapezoid

One pair of opposite sides parallel

### Parallelogram

Opposite sides parallel, opposite sides congruent

### Rhombus

Parallelogram, 4 congruent sides

### Rectangle

Parallelogram, 4 right angles

### Square

Parallelogram, 4 right angles, 4 congruent sides

### Transformation

The movement of a geometric figure

### Intersecting Lines

A straight path that has one end point and extends forever in the opposite direction

### Congruent figures

Figures that are the same size and same shape

### Similar figures

Figures that are the same shape and may or may not have the same size

### Line of symmetry

Place where a figure can be folded so that both halves are congruent

### Complementary angles

Angles that add up to 90

### Supplementary angles

Angles that add up to 180

Example: