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Geometry
Geometry Terms
48
Mathematics
5th Grade
12/07/2009

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Cards

Term

A polygon with three sides

 

Definition

Triangle

 

Term

A polygon with five sides

 

Definition
Pentagon
Term

A polygon with six sides

 

Definition

Hexagon

 

Term

A polygon with seven sides

 

Definition

Hexagon

 

Term
A polygon with eight sides
Definition
Octagon
Term
A polygon with nine sides
Definition
Nonagon
Term
A polygon with ten sides
Definition
Decagon
Term
A polygon with twelve sides
Definition
Dodecagon
Term
What is a flat surface of a solid figure called?
Definition
A face
Term
What is formed where two faces meet?
Definition
An edge
Term
What is a point where edges meet called?
Definition
A Vertex
Term
What is a triangle called where the lengths of all the sides are different?
Definition
Scalene
Term
What is a triangle that has at least one right angle?
Definition
Right Triangle
Term
What is a triangle called that has two sides of equal length?
Definition
Isosceles Triangle
Term
What is a triangle called where all the sides are of equal length?
Definition
Equilateral Triangle
Term
What is a polygon called that has four sides and four angles? The opposite sides of the figure are parallel to each other.
Definition
Parallelogram
Term
What is a polygon called that has four sides and four angles?
Definition
Quadrilateral
Term
What is a polygon where all the sides are of equal length?
Definition
Regular Polygon
Term
What is a polygon called where all the sides aren't of equal length?
Definition
Irregular Polygon
Term
What is a polygon called that has four sides, four right angles, and where the opposite sides are parallel?
Definition
Rectangle
Term
What is a polygon called that has four sides of equal length, four right angles, and opposite sides that are parallel?
Definition
Square
Term
What is a point where the sides meet called?
Definition
Vertex
Term
What are all closed figures that have three or more sides called?
Definition
Polygons
Term
What are lines that cross at a right angle called?
Definition
Perpendicular Lines
Term
What are lines that never intersect called?
Definition
Parallel Lines
Term
What are lines that cross at a common point called?
Definition
Intersecting Lines
Term
What is an angle called that has more than 90 degrees?
Definition
Obtuse Angle
Term
What is an angle called that has exactly 90 degrees?
Definition
Right Angle
Term
What is an angle called that measures less than 90 degrees?
Definition
Acute Angle
Term
What is formed by two rays that have the same endpoint?
Definition
An Angle
Term
What is a line called that has one endpoint and extends in the other direction without an endpoint?
Definition
Ray
Term
What is part of a line that has two endpoints called?
Definition
Line Segment
Term
What is a geometrical object that is usually straight and infinitely long called?
Definition
Line
Term
What are two angles called that add up to 90 degrees?
Definition
Complementary Angles
Term
What are two angles called that add up to 180 degrees?
Definition
Supplementary Angles
Term
What is a polygon called that has all its interior angles less than 180 degrees?
Definition
Convex Polygons
Term
What is a polygon called that has one or more interior angles that are greater than 180 degrees?
Definition
Concave Polygon
Term
What is the formula for the area of a triangle?
Definition
Area = 1/2 * base * height
Term
What is the formula for the area of a rectangle?
Definition
Area = length * width
Term
What is the formula for the area of a circle?
Definition
Area = radius2 * Π
Term
What is the formula for the circumference of a circle?
Definition
Circumference = 2 * radius * Π
Term
What is the formula for the volume of a rectangular prism?
Definition
Volume = length * width * height
Term
What is the formula for the volume of a sphere?
Definition
Volume = 4/3 * radius3 * Π
Term
What is a polygon with four sides where opposite sides are parallel and all four sides are equal?
Definition
Rhombus
Term
What is a polygon with four sides that has only one pair of parallel lines?
Definition
Trapezoid
Term
What is the distance around a circle?
Definition
Circumferenc
Term
What is the distance across the center of a circle called?
Definition
Diameter
Term
What is half the distance across the center of a circle?
Definition
Radius
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