# math vocab

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### Polygon

a closed figure with 3 or more line segments

a polygon with four sides

### pentagon

a polygon with five sides

### angles

the figure formed by 2 rays with the same endpoint

### octagon

a polygon with eight sides

### decagon

a polygon with 10 sides

### scalene

a shape with no congruent sides

### isosceles

a shape with more than 1 congruent sides

### equilateral

a polygon with all sides congruent

### right

a shape or figure with a 90 degree angle

### parallelogram

a quadrilateral whose opposite sides are parallel

### rectangle

a parallelogram with four right angles

### trapezoid

a quadrilateral with one pair of parallel sides

### square

a rectangle which is equilateral

### degrees

the basic unit by which angles are measured

### vertex

the intersection of the two sides of an angle i

### points

a dot that represents a location in a plane or space

### line

a straight path of points that extend forever in opposite directions

### plane

a flat surface that extends forever in all different directions

### ray

part of a line that has 1 endpoint and extends forever in only 1 direction

### line segment

part of a line consisting of 2 endpoints and all the points between them

### congruent

shapes that are exactly the same

### intersection

the set of points that are common to 2 or more lines

### parallel

lines in the same place but do not intersect

### vertex

the point at the corner with an angle, plane angle, or solid figure

### measure

the measure of something (angle)

### protractor

to use and approximate the measure of an angle

### perpendicular

2 lines that meet at right angles

### complementary

2 angles that if the sum of their measure is 90 degrees

### supplementary

2 angles and if the sum of their measure is 180 degrees

### vertical angles

angles that are formed by intersecting lines (angles across from each other)

### corresponding angles

angles that are formed by intersecting lines (horizontal lines that form angles)

### skew lines

in 3-D world, lines don't cross but not parallel

### scalene triangle

all sides have different lengths

### isosceles triangle

at least 2 sides have to be the same

### equilateral triangle

all 3 sides have to be the same (60 degrees)

### acute triangle

if all 3 angles are acute

### obtuse triangle

if 1 of the angles are obtuse

### right triangle

if one of the angles is a right angles

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