###
Chord

A segment inside the circle which has end points on the sides of the circle.

###
Hexagon

a polygon with six sides

###
180

Total measure the angles in every triangle.

###
Rhombus

A quadrilateral, parallelogram with 4 congruent sides

###
Scalene

A triangle with NO sides congruent

###
Square

A quadrilateral, parallelogram with 4 congruent sides and 4 right angles

###
Supplementary

Angles whose sum is 180

###
Straight

An angle that measures exactly 180

###
Obtuse

An angle that measures between 90-180

###
Nonagon

A polygon with 9 sides

###
Line

A series of points that extends indefinitely in both directions

###
Right

An angle that measures exactly 90

###
Right Triangle

A triangle with1 right angle

###
Regular Polygon

A polygon with ALL sides congruent and ALL angles congruent

###
Ray

Part of a line that extends indefinitely in ONE direction with ONE end point

###
Parallel lines

Lines that NEVER intersect

###
Rectangle

A quadrilateral, parallelogram with 4 right angles

###
Equilateral

A triangle with 3 congruent sides

###
Triangle

A polygon with 3 sides

###
Skew lines

Lines that are NOT in the same plane, that are NOT parallel, and do NOT intersect

###
Radius

A segment that connects the center of the circle to any point on the edge of the circle

###
Trapezoid

A quadrilateral with exactly ONE pair of parallel sides.

###
Diameter

A chord that crosses through the center of the circle

###
Complementary

Angles whose sum is 90

###
Decagon

A polygon with 10 sides

###
Congruent Sides

Sides that are equal

###
Congruent Angles

Angles with equal measures

###
Acute

An angle that measures between 0-90

###
Parallelogram

A quadrilateral with 2 pairs of parallel lines

###
Octagon

A polygon with 8 sides

###
Semicircle

An arc that is exactly half of the circumference; use the diameter as a side

###
Acute Triangle

has 3 Acute angles

###
Segment

Part of a line with 2 endpoints

###
Vertical

Angles that are across from each other; they share a vertex only

###
Circle

A series of points equidistant from a given point, the center; NOT A POLYGON

###
Heptagon

A polygon with 7 sides

###
Obtuse Triangle

A triangle with 1 obtuse angle

###
Pentagon

A polygon with 5 sides

###
Vertex

The intersection of two segments or rays

###
Plane

A flat surface that extends indefinitely in all directions

###
Point

Indicates a location

###
Quadrilateral

Any Polygon with 4 sides

###
Adjacent

Angles that are next to each other; share a side and vertex

###
Intersecting lines

lines or segments that have one point in common; they cross over each other

###
Angle

Formed by the intersection of two rays or segments

###
Irreagular Polygon

When all sides and angles are NOT congruent

###
Arc

Outside portion of a circle between two points

###
Isosceles

A triangle with 2 congruent sides

###
Central Angle

An angle inside the circle that has the center of the circle as a vertex of the angle

### Please allow access to your computer’s microphone to use Voice Recording.

## We can’t access your microphone!

### Click the icon above to update your browser permissions and try again

Example:

### Reload the page to try again!

Reload

## Press Cmd-0 to reset your zoom

## Press Ctrl-0 to reset your zoom

### It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

## Your microphone is muted

### For help fixing this issue, see this FAQ.