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### 26 Cards in this Set

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• Back
 Semiregular Polyhedron A polyhedron with several different regular polygonal regions for faces but with the same arrangement of polygons at each vertex. Pyramid A polyhedron formed by using a polygon for the base and a point not in the plane of the base that is connected with line segments to each vertex of the base. Acute Triangle A triangle with all angles less than 90 degrees. Isosceles Trapezoid A trapezoid with one pair of congruent sides. Rhombus A quadrilateral with four sides that are congruent. Polyhedron The union of polygonal regions, any two of which have at most a side in common. Right triangle A triangle with one 90 degree angle. Regular Polygon/ Regular n-gon A polygon where all sides are congruent and all angles are congruent. Isosceles Triangle A triangle with at least two congruent sides. Right Prism A prism where the lateral faces are rectangles and the dihedral angle is formed bya base and a lateral face is a right angle. Scalene Triangle A triangle that has no congruent sides or angles. Trapezoid A quadrilateral with exactly one pair of parallel sides. Polygon A simple closed "curve" made up of line segments (Polygon means many angles). Kite A quadrilateral with two nonoverlapping pairs of adjacent sides that are the same length. Equilateral Triangle A triangle with all sides and all angles congruent. Parallelogram A quadrilateral with two pairs of parallel sides. Obtuse Triangle A triangle with one angle greater than 90 degrees. Square A quadrilateral with four sides the same length and four right angles. Rectangle A quadrilateral with four right angles. Triangle A closed figure composed of exactly three line segments Simple Closed Curve A curve that can be traced with the same starting and stopping points and without crossing or retracing any part of the curve. Regular Polygon/ Regular n-gon A polygon where all sides are congruent and all angles are congruent. Quadrilateral A closed figure composed of four line segments. Right Regular Pyramid A pyramid whose bases are regular polygons and whose lateral faces are isosceles triangles. Regular Polyhedron A polyhedron in which all the faces are identical regular polygonal regions and all dihedral angles have the same measure. Prism A polyhedron with two opposite faces that are identical polygons.