Name that Word
A flat surface that goes on forever in all directions
Plane
A ____ has no sides and is perfectly round
circle
What is the definition of a radius?
A line from the center of a circle to the edge
Another word for "corner"
Vertex
What is the difference between area and perimeter?
Area covers inside; perimeter measures around
A figure with three sides
Triangle
A ____ angle measures exactly 90 degrees
Right
What is the definition of a polygon?
A closed figure made up of straight lines.
Another word for "edge length"
Side
How is a cube different from a square?
A cube is 3D; a square is 2D
A line that divides a shape into two equal parts
Line of Symmetry
perimeter
What is the definition of a vertex?
The point where two or more lines or edges meet
Another word for "evenly balanced"
Symmetrical
What's tricky about the word face in geometry?
It means a flat surface on a 3D figure, not someone's face!
A solid figure with six square faces
Cube
A ____ has opposite sides that are parallel and equal in length.
Rectangle
What is the definition of area?
The number of square units inside a shape
Another word for "outline of a shape"
perimeter
How is radius different from diameter?
A diameter is twice the radius
A 3D figure with one circular base that comes to a point
Cone
The amount of space inside a 3D object is its ____
volume
What is the definition of a prism?
A solid figure with two identical bases and rectangular sides.
Another word for "space inside"
Volume or area
Why isn't a circle a polygon?
Because it doesn't have straight sides