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Terms in this set (24)
Right angle:
An angle that is exactly 90 degrees.
Obtuse angle:
An angle that is more than 90 degrees but less than 180 degrees.
Acute angle:
An angle that is less than 90 degrees.
Reflex angle:
An angle that is more than 180 degrees.
Supplementary Angle:
Two or more angles that add up to 180 degrees.
Complementary Angle:
Two or more angles that add up to 90 degrees.
Vertical:
Angles that are opposite each other when two lines intersect.
Vertical angles are always congruent
Adjacent:
Angles that have a common side and a common vertex (this means they share a side and vertex).
Triangle Interior Angles:
The interior angles will always add up to 180 degrees.
Quadrilateral Interior Angles
The interior angles will always add up to 360 degrees.
Interior Angle
An angle inside of a polygon
Exterior Angle
An angle outside of a polygon
Line:
A line is straight, has no thickness, and goes on infinitely (forever) in both directions.
Line Segment:
Part of a line that is bounded by two endpoints (it connects two points)
Ray:
A portion of a line that has a starting point (an endpoint), but goes on infinitely in one direction
Endpoint:
A point at which a line segment or ray ends.
Angle
A figure formed by two rays sharing a common endpoint.
We can measure an angle by measuring the amount of turn between the two rays
Vertex
The common endpoint of an angle(s)
Side
A type of line segment that joins two vertices in a polygon.
Point
An exact location on a plane surface.
A point has no size, length, or depth.
Polygon
A closed, plane figure consisting of at least 3 or more sides, angles, and vertices
Triangle
A polygon with exactly three sides, angles, and vertices.
Quadrilateral
A polygon with exactly four sides, angles, and vertices
Congruent
Congruent means equivalent (or equal).
< CAB and < FDE are congruent
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