# Math games

## 44 terms

### acute angle

an angle that is less than 90 degrees

### acute triangle

A triangle with three acute angles

are a pair of angles with a common vertex and a common side

### arc

a continuous portion of a ciricle

no symmetry

### center of a circle

set of planes that are all the same distance from a point

### center of rotation

the point the figure rotates around

### central angle

an angle whose vertex is the center of a circle

### chord

a straight line connecting two points on a curve

### circle

a round plane figure whose boundary is the same all around

### complementary angle

two angles that add up to 90 degrees

### congruent

Having the same size and shape

### corresponding angles

are on the same side of the transversal and are both above or both below the parallel lines.

### diameter

line segment that passes through the center of a circle, and whose endpoints are on the circle

### equilateral triangle

a triangle with three equal sides

### image

is the resulting figure from a transformation

### isosceles triangles

has two congruent sides

### line

is a straight path that extends without end in opposite directions

### line of reflection

what a figure flips across to create a mirror image

### line of symmetry

the line along which the figure is divided

### line segment

is a part of a line or a ray that extends from one endpoint to another

### line symmetry

is the line that goes down the middle of the shape so each half is a mirror image of inself

### obtuse angle

a angle that measures more than 90º but less than 180º

### obtuse triangle

has exactly one obtuse angle

### parallel lines

lines in a plane that do not intersect

### parallelogram

a quadrilateral with two pairs of parallel sides

### perpendicular lines

lines that intersect to form right angles

### plane

a flat surface that extends forever

### point

an exact location in space

### polygon

a closed plane figure formed by three or more line segments that intersect only at their endpoint

a line segment with one endpoint at the center of a circle and the other endpoint on the circle, or the length of that sigment

### ray

a part of a line that starts one endpoint and extend forever

### rectangle

a parallelgram with four right angles

### reflection

a transformation of a figure that flips the figure across a line

### regular polygon

a polygon with congruent sides and angles

### rhombus

a parallelogram with all sides congruent

### right angle

an angle that measures 90º

### right triangle

a triangle containing a right angle

### rotation

a transformation in which a figure is turned around a point

### rotational symmetry

a figure has rotational symmetry if it can be rotated less than 360º

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