## 31 terms

### line segment

A part of a line with two endpoints

### Perpendicular Lines

Lines that meet or cross at a right angle.

### Intersecting Lines

Lines that meet and cross each other

### Parallel lines

Lines that stay the same distance apart and never meet.

### Angle

An angle is formed when two rays or line segments meet at the same endpoint.

### vertex

The point where two rays meet. The place where two sides of a polygon meet.

### right angle

An angle that measures exactly 90 degrees.

### acute angle

An angle that measures less than 90 degrees.

### obtuse angle

An angle that measures more than 90 degrees, but less than 180 degrees.

### straight angle

An angle that measures exactly 180 degrees.

### trapezoid

A quadrilateral with only one pair of parallel sides

### right trapezoid

A quadrilateral with only one pair of parallel sides and 2 right angles.

### parallelogram

Both pairs of opposite sides are parallel and the same length.

### rhombus

A parallelogram with all sides the same length

### square

A parallelogram with all sides the same length and 4 right angles.

### rectangle

A parallelogram with 4 right angles.

### right triangle

A triangle having 1 right angle.

### acute triangle

A triangle having 3 acute angles

### obtuse triangle

A triangle having 1 obtuse angle.

### equilateral triangle

A triangle having 3 sides equal in length and 3 angles equal in measure

### isosceles

A triangle having 2 sides equal in length and 2 angles equal in measure

### scalene triangle

A triangle having no sides the same length and no angles the same measure

### congruent

Having the same size and shape.

### similar

having the same shape

### corresponding sides

Sides that are in the same position in two congruent figures.

### corresponding angles

Angles that are in the same position in two congruent figures

### coordinate grid

A graph used to show location of points by using ordered pairs

### x-axis

the horizontal line on a graph-side to side

### y-axis

the vertical axis on a coordinate plane...top to bottom

### origin

The point of a coordinate grid where the horizontal and vertical axes meet, known as (0,0)

### ordered pair

A pair of numbers that gives the location of a point on a coordinate grid

### Flickr Creative Commons Images

Some images used in this set are licensed under the Creative Commons through Flickr.com. Click to see the original works with their full license.