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Chapter 12

Vocabulary

TermDefinition
Acute Triangle A triangle with 3 acute angles.
Attribute A characteristic of a figure.
Bases Two parallel congruent faces in a prism.
Composite Figures A figure that is made of two or more three-dimensional figures.
Congruent Angles Angles of a figure that are equal in measure.
Congruent Figures Two figures that have the same size and shape.
Congruent Sides Sides of a figure that are equal in length.
Cube A three-dimensional figure with six faces that are congruent squares.
Cubic Unit The unit of measure for volume.
Edge The line segment where to faces of a three-dimensional figure meets.
Equilateral Triangle A triangle with three congruent sides.
Face A flat surface.
Hexagon A polygon with six sides and six angles.
Isosceles Triangle A triangle with at least two congruent sides.
Net A two-dimensional pattern of a three-dimensional figure.
Obtuse Triangle A triangle with 1 obtuse angle and 2 acute angles.
Octagon A polygon with 8 sides.
Parallelogram A quadrilateral in which each pair of opposite sides is a parallel and congruent.
Pentagon A polygon with 6 sides.
Polygon A closed figure made up of line segments that do not cross each other.
Prism A three-dimensional figure with two parallel, congruent faces, called bases. At least three faces are rectangles.
Rectangle A quadrilateral with four right angles; opposite sides are equal and parallel.
Rectangular Prism A prism that has rectangular bases.
Regular Polygon A polygon in which all sides and angles are congruent.
Rhombus A parallelogram with four congruent sides.
Right Triangle A triangle with 1 right angle and 2 acute angles.
Scalene Triangle A triangle with no congruent sides.
Square A parallelogram with four congruent sides and four right angles.
Three-Dimensional Figure A figure that has length, width, and height.
Trapezoid A quadrilateral with exactly one pair of opposite sides parallel.
Triangular Prism A prism that has triangular bases.
Unit Cube A cube with a side length of one unit.
Vertex The point where three or more faces meet on a three-dimensional figure.
Volume The amount of space inside a three-dimensional figure.
Created by: AWesthoff
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