# Geometry Vocabulary Part I

### 20 terms by prothro

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Mrs. Prothro's geo vocab part one

### isosceles triangle

a triangle with two equal sides

### vertex

The common endpoint of an angle

### obtuse triangle

a triangle with one obtuse angle

### right triangle

a triangle with one right angle

### scalene triangle

a triangle with no two sides of equal length

### equilateral triangle

a triangle with three equal sides

### straight angle

an angle that measures 180 degrees

### obtuse angle

An angle more than 90 degrees

### right angle

an angle that measures 90 degrees

### angle

two rays with a common endpoint

### acute angle

An angle less than 90 degrees

### plane

An endless flat surface

### line segment

part of a line with two endpoints

### point

An exact location in space

### intersecting lines

lines that cross at one point

### ray

Part of a line that has one endpoint and extends forever in one direction.

### line

A straight path of points that goes on forever in two directions

### perpendicular lines

Two lines that intersect to form right angles

### parallel lines

Lines in the same plane that do not intersect

### Skew lines

Lines that do not intersect, are not parallel, and are not in the same plane

Example: