# Geometery Vocab, Chapter 6, Grade 5

### 36 terms by dalbarb

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### point

A fixed location in space.

### line

A straight path that continues without end in both directions.

### line segment

Part of a line between two endpoints.

### ray

Part of a line that has one endpoint and goes on without end in one direction.

### intersecting lines

Lines which cross each other, meeting at common point.

### perpendicular lines

Intersecting lines that form right angles.

### parallel lines

Lines in the same plane which do not intersect.

### plane

A flat surface that extends without end in all directions.

### right angle

An angle measuring 90 degrees.

### acute angle

An angle measuring less than 90 degrees.

### straight angle

An angle of 180 degrees.

### obtuse angle

An angle measuring greater than 90 degrees but less than 180 degrees.

### vertex

The endpoint at which two rays intersect.

### protractor

An instrument that is used for constructing and measuring angles.

### equilateral triangle

A triangle with tree sides of equal length.

### isosceles triangle

A triangel with at least two sides of equal length.

### scalene triangle

A triangle having three unequal sides.

### right triangle

A triangle having one 90 degree angle.

### acute triangle

A triangle having three acute angles.

### obtuse triangle

A triangle having one angle greater than 90 degrees.

### polygon

A closed plane figure formed by line segments.

### regular polygon

Has sides that are equal in length and angles that are equal in size.

A polygon with four sides.

### polyhedron

A solid figure having only flat surfaces called faces.

### circle

A closed plane figure with all points an equal distance from the center.

### compass

A tool used to draw a circle.

### diameter

A line segment crossing the center of a circle and having both endpoints on the circle.

A line segment from the center to a point on the circle.

### chord

A line segment with both endpoints on the circle.

### line symmetry

A line (or fold) that divides a figure into congruent halves.

### asymmetry

No lines of symmetry exist.

### translation (slide)

It moves the figure in a straight line, changing its location, but not its position.

### reflection (flip)

A move that turns the figure over on a line of symmetry.

### rotation (turn)

It moves the figure around a fixed point.

### congruent figures

Figures that have the same shape and size.

### similar figures

Figures that have the same shape but may not have the same size.

Example: