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30 Cards in this Set
 Front
 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 2D or 3D 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 2D 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 3D figure with a circular or noncircular 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 3D figure with circular or noncircular parallel congruent bases and curving sides


Diagonal

a line segment connecting two nonadjacent 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


Noncircular

a cone or cylinder with base(s) that are not circles but ovals or other curvy shapes


Oblique

a 3D 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
