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# C2_Chapter 11

### Chapter 11 Vocabulary

Base The base of a parallelogram or triangle is any side of the figure. The bases of a trapezoid are the parallel figure.
Center points on a circle or sphere are the same distance. The given point from which all
Circle The set of all points in a plane that are the same distance from a given point called the center.
Circumference The distance around a circle.
Composite Figure is made of triangles, quadrilaterals, semicircles, and other two-dimensional figures.
Cone A three-dimensional figure with a curved surface and a circular base.
Cylinder A three-dimensional figure with two parallel congruent circular bases.
Diameter The distance across a circle through the center.
Edge The segment formed by intersecting faces of a three-dimensional figure.
Face The flat surface of a three- dimensional figure.
Height The length of the segment perpendicular to the base with endpoints on opposite sides. In a triangle, the distance from a base to the opposite vertex.
Lateral Face One side of a three-dimensional figure.
Pi The ratio of the circumference of a circle to its diameter. An approximation often used for π is 3.14.
Prism A three-dimensional figure with at least three rectangular lateral faces and top and bottom faces parallel.
Pyramid A three-dimensional figure with at least three lateral faces that are triangles and only one base.
Radius The distance from the center of a circle to any point on the circle.
Rectangular Prism A solid figure that has two parallel and congruent bases that are rectangles.
Sector A region of a circle bounded by two radii.
Semicircle Half of a circle.
Sphere A three-dimensional figure in which all points are equal distance from the center.
Three-Dimensional Figure A figure with length, width, and depth (or height).
Triangular Prism A prism that has bases that are triangles.
Vertex The point where the edges of a three dimensional figure intersect.
Volume The number of cubic units needed to fill the space occupied by a solid.
Created by: Mrs_Irish