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# Geometry Basics III

### Circles and Solid Figures (Curved and Polyhedrons)

TermDefinition
Circumference The distance around a circle
Radius A line segment from the center of a circle to any point on the outside of the circle. It is equal to half the diameter
Diameter A line segment across a circle that passes through the center of the circle
Chord A line segment with both endpoints on the outside of the circle, but which does not pass through the center of the circle.
Arc A section of the circumference of a circle
Polyhedron A solid figure in which all sides are polygons
Pyramid A polyhedron that has one base and triangular faces
Prism A polyhedron that has two congruent bases
Edge The line segment where two faces of a polyhedron meet
Vertex The point where three edges meet
Curved solid Any solid figure with no edges
Sphere A curved solid with no bases or faces
Cone A figure with a flat circular base and one curved surface leading to a vertex
Cylinder A figure with one curved surface and two parallel bases that are congruent circles
Hemisphere Half a sphere with a circular base
Faces Connected polygons that makes up a section of a polyhedron
Sphere A curved solid that has no base
Created by: Rvanmeter