Notes 1.1
collinear
On the same line.
Having same measures, or lengths.
The common endpoint of the two rays of an angle.
vertex
An angle that measures more than 90 degrees but less than 180 degrees.
obtuse angle
No diagonal outside of the polygon.
convex
On the same plane.
coplanar
Has length and width, but no thickness.
plane
Formed by two rays that share a common endpoint, provided that the two rays are noncongruent.
angle
Linear pair
Equals the sum of the lengths of its sides.
Perimeter
Divide into two equal segments.
bisects
A straight, continuous arrangement of infinitely many points.
line
A ray that contains the vertex and divides the angle into two congruent angles.
angle bisector
An angle that measures less than 90 degrees.
acute angle
Is a line segment that connects two non-consecutive vertices.
diagonal
Begins at a point and extends infinitely in one direction.
Is a point on the segment that is the same distance from both endpoints.
midpoint
An angle that measures 90 degrees.
right angle
A pair of angles whose sum is 90 degrees.
complementary angles
Is a closed figure in a plane, formed by connecting line segments endpoint to endpoint with each segment intersecting exactly two others.
polygon
The most basic building block of geometry. It has no size only location.
point
Consists of two points called the endpoints of the segment and all the points in between them that are collinear with the endpoints
line segment
A pair of angles that has a sum of 180 degrees.
Supplementary
Are formed by two intersecting lines, they share a common point but not a common side.
vertical angles
At least one diagonal is outside of the polygon.
concave