# Geometry Lingo

## 34 terms

### Line

A straight path that goes on forever in opposite directions.

### Line Label

A label that is a line with arrows on both ends.

### Ray

A part of a line that has one endpoint and extends without end in one direction.

### Ray Label

A label that is a line with an arrow on one end

### Angle

A figure formed by two rays or line segments with two endpoints.

### Angle Lable

A label that is similar to a "less than symbol" only flat on the bottom.

### Parallel

The same distance apart at every point.

### Perpendicular

Lines, line segments, or rays are this if they form right angles.

### Oblique Lines

Lines that are not parallel or perpendicular.

### Protractor

A semicircular instrument for measuring and constructing angles.

### Degree

A unit of measuring angles. Also a unit for measuring temperature.

### Right Angle

An angle that measure 90 degrees.

### Intersecting Lines

Lines that cross at the same point.

### Complementary

Two angles whose sum of their measures is 90 degrees.

### Supplementary

Two angles whose sum of their meaures is 180 degrees.

### Acute

Angle greater than 0 degrees and less than 90 degrees.

### Right Angle

A 90 degree angle.

### Obtuse

Angle greater than 90 degrees and less than 180 degrees.

### Straight Angle

A 180 degree angle.

### Reflex Angle

Angle greater than 180 degrees and less than 360 degrees.

### Circle

A shape that measures 360 degrees.

Left turn

Right turn

90 degrees.

180 degrees.

270 degrees.

### 4 turns

360 degrees.

A two-dimensional figure with four sides.

### Congruent

figures that are the same shape and size.

### Polygon

A closed plane figure with sides made of straight line segments.

### Vertical Angles

A pair of opposite angles formed by intersecting lines.

### Opposite Angles

These angles are formed by two intersecting lines and have the same measure.

### 360 degrees

The sum of the interior angles of a quadrilateral.

### 180 degrees

The sum of the interior angles of a triangle.