# Geometry - Part 1

## 26 terms

### geometry

the study of position, shape, and size of figures

### point

a location in space that has no length, width, or height.

### line

a straight, continuous, and unending path made up of a collection of points in a plane

### line segment

a part of a line and has two endpoints

### ray

part of a line that is made up of one endpoint and all the points on one side of it.

### plane

a flat surface made up of a continuous and unending collection of points.

### intersecting

lines that have one point in common

### parallel

lines that lie in the same plane but never intersect

### perpendicular

lines that intersect at right angles

### vertex

The common endpoint of an angle

### protractor

a tool used to measure angles

### degrees

the unit of measurement used for angles

### right

an angle that measures 90 degrees is classified as this

### acute

an angle that measures less than 90 degrees

### obtuse

an angle that measures more than 90 degrees

### straight

an angle that measures 180 degrees

### equilateral

a triangle that has 3 equal sides

### isosceles

a triangle with 2 sides the same length

### scalene

a triangle where no sides are the same length

### congruent

figures, lines, or angles that are the same size or shape

a polygon with 4 sides and 4 angles

### rectangle

a polygon with opposite sides are congruent and 4 right angles

### square

a polygon with 4 congruent sides and 4 right angles

### parallelogram

a polygon with opposite sides congruent and parallel

### rhombus

a polygon with 4 congruent sides and opposite sides parallel

### trapezoid

a polygon with one pair of parallel sides

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