Geometry

STUDY
PLAY
Adjacent
side by side, these angles share a common ray
Angles
formed by two rays with a common endpoint (vertex)
Area
space taken up by a two-dimensional shape
Base
in two-dimensional shapes it is bottom of a shape (perpendicular to the height) used to calculate area; in three-dimensional figure it is the flat surface used to calculate volume
Circumference
distance around the exterior of a circle
Complementary
sum of 90°, these angles add up to 90°
Degrees
measurement used to measure angles
Diameter
distance across a circle through the center of the circle
Exterior Angle
the angle between any side of a shape and a line extended from the next side
Height
measure of a shape used to calculate area, always perpendicular to the base
Interior Angle
an angle inside a shape
Radius
distance from the center of a circle to any point on the outside of the circle
Right Rectangular Prism
a solid three-dimensional object with six faces that are rectangles; it is a prism because it has the same cross-section along a length
Square Pyramid
square base connected to apex, four side faces are triangles
Side
flat edge of a two-dimensional shape; flat face of a three-dimensional figure
Supplementary
sum of 180°, these angles add up to 180°
Surface Area
the combined area of all the faces of a three-dimensional figure
Three-Dimensional Figures
have length, width (or depth), and height
Two-Dimensional Figures
have length and width
Vertical
these angles are formed by intersecting lines, share a common vertex, but no common sides, and are congruent (equal in measure)
Volume
space inside a three-dimensional figure
Unique Triangle
a triangle that can only be drawn one way
Cross Section
the two-dimensional shape you get when you slice a three-dimensional figure