###
Acute Angle

Angle measuring less than 90 degrees

###
Obtuse Angle

Angle measuring more than 90 degrees

###
Right Angle

Angle measuring exactly 90 degrees

###
parallelogram

a quadrilateral with opposite sides parallell

###
Trapezoid

a quadrilateral with exactly one pair of parallel sides

###
collinear

lying on the same line

###
coplanar

lying on the same plane

###
point, line, plane

Building blocks of Geometry, undefined terms

###
line segment

two points (the endpoints) all the points between them that are on the line containg them.

###
congruent segment

segments that have the same measure

###
midpoint

a point ON a line segment that is equally distant from both endpoints.

###
ray

all points on a line that lie on one side of a point (the ray's endpoint).

###
congruent angles

angles that have the same measure

###
angle

formed by two rays that share an endpoint so long as they do not overlap

###
angle bisector

a ray that shares the vertex of the angle and divides the angle into two congruent angles.

###
degrees

the unit in which angles are measured

###
Vertical Angles

formed by intersecting lines and do not share a common/adjacent side.

###
Linear Pair of Angles

a pair of angles that share a side and their non-shared side form a straight line (they are supplementary)

###
supplementary angles

two angles whose sum is 180 degrees

###
complimentary angles

two angles whose sum is 90 degrees

###
polygon

closed figure in a plane, formed by connecting line segmenst endpoint to endpoint with each segment intersecting exactly two others.

###
diagonal

a line segment that connects two NON-consecutive vertices

###
congruent polygons

polygons that have exactly the same size and shape.

###
equilateral polygon

polygon that has all equal sides

###
equiangular polygon

polygon that has all equal angles

###
regular polygon

polygon that has all equal angles AND sides

###
right triangle

a triangle with exactly one right angle

###
actue triangle

a triangle with all angles less than 90 degrees

###
obtuse triangle

a triangle with exactly one obtuse angle

###
scalene triangle

a triangle with no equal sides

###
equilateral triangle

a triangle with all equal sides

###
isosceles triangle

a triangle with two OR MORE equal sides

###
rhombus

a parallelogram with equal sides

###
square

a parallelogram with equal angles and sides. (a regular quadrilateral)

###
kite

a quadrilateral that has two pair of distinct, consecutive congruent sides

###
circle

set of all points in a PLANE that are a give distance from a given point

###
diameter (of a circle)

a line segment containing the center of a circle, with endpoints that lie on the circle

###
radius

a segment from the center of a circle to a point on the circle.

###
concentric circles

circles that share a center

###
congruent circles

circles that have the same radius

###
semicircle

an arc of a circle whose endpoints are on the diameter

###
minor arc

an arc that is smaller than a semicircle (name with 2 letters)

###
major arc

an arc that is larger than a semicircle (name with 3 letters)

###
central angle

an angle whose vertex is at the center of a circle

###
chord

a segment with both of its endpoints on the circle

###
tangent

a line that intersects a circle exactly once

###
Point of tangency

point where a tangent line intersects a circle

###
measure of an arc

equivalent to the measure of it's central 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 above 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.