# Geometry

## 34 terms

### point

an exact location in space

### line

an endless collection of points along a straight path

### line segment

part of a line that has two end points

### ray

part of a line that has one endpoint and extends endlessly in the other direction

### plane

an endless flat surface that is named by any three parts not in the same line

### intersecting lines

lines that have exactly one point in common

### parallel lines

lines in the same plane that never intersect

### perpendicular lines

two lines that intersect at right angles

### acute angle

an angle that measure less than 90 degrees

### right angle

an angle that measures 90 degrees

### obtuse angle

an angle with a measure greater than 90 degrees but less than 180 degrees

### straight angle

an angle that measures 180 degrees

### polygon

a closed plane figure with 3 or more sides

a 4 sided polygon

### pentagon

a 5 sided polygon

### hexagon

a 6 sided polygon

### heptagon

a 7 sided polygon

### octagon

a 8 sided polygon

### nonagon

a 9 sided polygon

### decagon

a 10 sided polygon

### acute triangle

a triangle with 3 acute angles

### obtuse triangle

a triangle with one obtuse angle

### equilateral triangle

a triangle with all sides equal

### isosceles triangle

a triangle with two congruent sides

### scalene triangle

a triangle that has no congruent sides

### parallelogram

parallelogram- a quadrilateral with 2 sets of parallel sides

### rhombus

a parallelogram with 4 equal sides

### square

a rhombus with 4 right angles

### rectangle

a parallelogram with 4 right angles

### trapezoid

a quadrilateral with only 1 set of parallel sides

where edges meet

### edge

where faces meet on a space figure

### face

a flat surface on a space figure

### right triangle

a triangle with one right angle

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