# Geometry

### 31 terms by Pon-Pallace

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Geometry vocabulary (common core)

### plane

an endless flat surface

### parallel lines

lines that NEVER intersect

### intersecting lines

lines that pass through the same point

### perpendicular lines

lines that form right angles (perfect square corners; 90 degrees)

### line segment

a part of a line with two endpoints

### ray

a part of a line that has one endpoint and continues on forever in one direction

### right angle

measures 90 degrees; forms a perfect square corner

### acute angle

measures less than a right angle

### obtuse angle

measures greater than a right angle, but less than a straight angle

### straight angle

forms a straight line

### polygon

a closed plane figure made up of line segments

### side

a line segment of a polygon

### vertex

the point where two sides meet on a polygon

3-sided polygon

4-sided polygon

5-sided polygon

6-sided polygon

8-sided polygon

### equilateral triangle

has 3 equal sides

### isosceles triangle

has 2 equal sides

no equal sides

### right triangle

has 1 right angle

### acute triangle

has 3 acute angles

### obtuse triangle

has 1 obtuse angle

### parallelogram

has 2 pairs of parallel sides

### square

*has 4 right angles
*has 2 pairs of parallel sides
*all sides are equal

### rectangle

*has 4 right angles
*has 2 pairs of parallel sides
*opposite sides are equal in length

### rhombus

*has 2 pairs of parallel sides
*all sides are equal

### trapezoid

*has 1 pair of parallel sides

### symmetric

when a figure can be folded on a line to form two equal halves that fit on top of each other

the fold line

Example: