Elements of geometry
A set of points that extends forever in two opposite directions.
What is a line?
Two lines in the same plane that do not intersect.
What is parallel?
A figure formed by two rays with the same endpoint.
What is an angle?
A polygon with three sides.
What is a triangle?
The distance between two points.
What is line segment measure?
A position in space represented with a dot.
What is a point?
Lines that intersect at right angles.
What is perpendicular?
An angle whose measure is 90˚.
What is a right angle?
The size of an angle, typically measured in degrees (°).
What is angle measure?
A flat surface that extends infinitely in all directions.
What is a plane?
Points on the same line.
What is colinear?
An angle whose measure is less than 90˚.
What is an acute angle?
Part of a line with two endpoints
What is a line segment?
Points or lines on the same plane.
What is coplanar?
An angle whose measure is greater than 90° and less than 180°.
What is an obtuse angle?
When figures have the same shape but not necessarily the same size.
What is similarity?
Two angles whose measures have a sum of 90°.
What are complementary angles?
A part of a line that has one endpoint and extends without end in one direction.
What is a ray?
An angle whose measure is 180°.
What is a straight angle?
Having the same size and shape.
What is congruence?
Two angles whose measures have a sum of 180˚.
What are supplementary angles?