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Chapter 1 - Tools of Geometry
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Gravity
Basic geometry vocabulary that you MUST know.
Terms in this set (34)
Point
A location in space that has no length, width, or depth.
Line
Made up of an infinite number of points. Has infinite length, but no thickness or width.
Plane
A flat surface that has infinite length and width, but no depth.
Line Segment
A part of a line between two points.
Collinear Points
Points on the same line or line segment.
Ray
Part of a line that starts at one point and goes infinitely in one direction.
Angle
Formed by two rays that meet at an endpoint or formed by two intersecting lines. Measured in degrees.
Vertex
The endpoint where two rays meet to form an angle.
Right Angle
An angle that measures 90 degrees.
Straight Angle
An angle that measures 180 degrees.
Acute Angle
An angle that measures between 0 and 90 degrees.
Obtuse Angle
An angle that measures between 90 and 180 degrees.
Congruent
Two or more figures that are the same size and shape. Sides are equal in length and angles are equal in measure.
Line Bisector
Cuts a line segment into two congruent segments.
Angle Bisector
Cuts an angle into two congruent angles.
Adjacent Angles
Angles that share only one side and a vertex, but have no common interior points.
Linear Pair
Two adjacent angles formed by the intersection of two lines. These angles are supplementary (add to 180 degrees).
Vertical Angles
Two non-adjacent angles formed by two intersecting lines - across from each other. (<1 and <3 or <2 and <4)
Complementary Angles
Two angles whose measures add to 90 degrees.
Supplementary Angles
Two angles whose measures add to 180 degrees.
Parallel
Two lines in a plane that never meet
Perpendicular
Two lines in a plane that intersect at right angles
Polygon
A closed figure formed by three or more line segments that intersect only at their endpoints.
Regular Polygon
A polygon with equal angles and equal sides.
Perimeter
The sum of the lengths of the sides of a polygon.
Circumference
The distance around a circle.
Area
the number of square units needed to cover a flat surface
Prism
Pyramid
Cylinder
Cone
Sphere
Surface Area
The total area of the surface of a three-dimensional object
Volume
The amount of space enclosed by a solid (three-dimensional) figure.
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