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### 30 Cards in this Set

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• Back
 Acute angle an angle measuring between zero and 90 degrees Acute triangle a triangle with three acute angles Atlernate exterior angles congruent angles formed by two parallel lines cut by a transversal; located on opposite sides of the transversal outside the parallel lines Alternate interior angles congruent angles formed by two parallel lines cut by a transversal; located on opposite sides of the transversal between the parallel lines Altitude the height of a 2-D or 3-D geometric figure measured perpendicularly from the center of the top face or point to the center of the base Base the top and bottom parallel polygonal faces Center the point in the middle of the circle or sphere Circle a 2-D figure; the set of all points at a given distance from the center Circular a cone or cylinder with circles for base(s) Circumference the perimeter of a circle Closed curve a curve that can be traced without lifting the pencil, has the same starting/stopping points and may cross itself (creates an inside and outside of the curve) Complementary angles two or more angles that sum to 90 degrees Concave a line segment connecting two points of the interior can go outside the polygon; at least one of the interior angles is greater than 180 degrees Cone a 3-D figure with a circular or non-circular base and rounding sides rising to a point Congruent of the same size and shape Convex polygon a line segment connecting any two points of the interior does not go outside the polygon; none of the interior angles is greater than 180 degrees Corresponding angles congruent angles formed by two parallel lines cut by a transversal; positioned on matching "corners" of intersections Cylinder a 3-D figure with circular or non-circular parallel congruent bases and curving sides Diagonal a line segment connecting two non-adjacent vertices of a polygon Equiangular triangle a triangle with three congruent angles Equilateral triangle a triangle with three congruent sides Isosceles trapezoid a trapezoid with two congruent legs Isosceles triangle a triangle with two congruent legs Kite a quadrilateral with two pair of adjacent congruent sides Lateral faces the polygon shapes making up the sides of a polyhedron Non-circular a cone or cylinder with base(s) that are not circles but ovals or other curvy shapes Oblique a 3-D geometric figure with an altitude not perpendicular to the base Obtuse angle an angle measuring between 90 and 180 degrees Obtuse triangle a triangle with one obtuse angle Parallel lines lines that never intersect in a plane