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### 72 Cards in this Set

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 Angle Corner formed by the intersection of 2 line segments, rays, or lines Area Space occupied by a 2D figure Base The # in a expression that has a power or exponent above it; the line or plane upon which a geometric firgure is thought of as resting. Circumference The distance measured by the line bounding a circle Complement For any event E, there is a corresponding event consisting of all the outcomes not in E. Complementary angles 2 angles whose measures total 90 degrees Cone A 3D figure with a circular base and the top meeting at a vertex; it resembles a funnel. Congruent 2 measures with the exact same value Cross-multiplying Multiplying the denominator of one ratio in a proportion by the numerator in the other ration and vice versa. Cylinder A 3D figure with 2 circular bases; resembles a can like a can Deca Metric prefix meaning "ten" Decagon a ten sided polygon Deci Metric prefix meaning "one-tenth" Denominator the bottom number in a fraction; it idicates into how many parts the whole is divided. Dodecagon a 12 sided polygon Edge a line or line segment at which 2 plane surfaces meet Face anyone of the surfaces of a geometric figure Heptagon a 7 sided polygon Hexagon a 6 sided polygon Hyptenuse The longest side of a right triangle, located opposite the right angle Icosagon a 20 sided polygon Interest Money paid for the use of money expressed as a percentage per unit of time Line Continuously connected points extending to infinity Line segment Continously connected points with 2 distinct start and end points Liter Metric unit of measure for volume or capacity Milli Metric prefix meaning "one- thousandth" Nonagon a 9 sided polygon Obtuse angle An angle whose measure is greater than 90 degrees Octagon An 8 sided polygon Orderd pair the x- axis coordinate and the y- axis coordinate (x, y) Parallelogram a quaderlateral w/ both pairs of opposite sides parallel Pentagonal prism a prism with 2 pentagonal bases Pentagonal pyramid a pyramid with a pentagonal base Perimeter distance around a figure Pi the ratio of a circumference of a cirlce to its diameter; the aprox. value is 3.14 Polygon a closed plane figure; 2D figure Polyhedron a solid figure; 3D figure Principal the amount of debt or investment minus the interest Prism a 3D object with rectangles for sides or faces Probability A # from 0 to 1 that states the likelihood an event will occur Proportion an equation with 2 equal ratios on each side of the equal sign Pyramid a 3D figure with triangles for sides or faces Quadrilateral a 4 sided polygon Radius A straight line extending from the center of the circle or sphere to the periphery Ratio a comparison of 2 #'s; can be written in the form 1/4 1:4 or 1 to 4 Ray A line extending in one direction from a fixed point Reciprocal THe inversion of a fraction (the numerator becomes the denominator and the denominator becomes the numerator) Rectangle a parallelogram with 90 degree angles Rectangular Prism a prism with 2 rectangular bases Rectangular pyramid a pyramid with a rectangular base Regular a 2D figure with all sides the same length and all angles the same measure Rhombus a parallelogram with sides of equal length Right angle an angle whose measure is exactly 90 degrees Right triangle a triangle with one right angle Rise how many units up or down a line travels on a graph b/w 2 points Run how many units left or right a line travels on a graph b/w 2 points Scale A form of ratio often used in maps or models where the first number is the dimension of the map or model and the 2nd # is the dimension of the actual object; written in the form 1:4 Simple interest found by multiplying the principal by the annual interest rate and then multiplying the result by the # of years or time; i= p*r*t Similar triangles if each side of 1 triangle can be multiplied by the same # and the result is the length of each side of a second triangle Slant height The height of a lateral side in a 3D figure Slope Ratio of the rise to the run Sphere a 3D figure that is completely circular in width and height; looks like a hollow ball Square a parallelogram with 90 degrees and sides of equal length Trapezoid a quadrilateral with only 1 pair of opposite sides parallel Triangle a 3 sided figure Triangular prism a prism with 2 triangular bases Triangular pyramid a pyramid with a triangular base Vertex the point where an angle is formed; the corner point of a geometric figure Vertical angles opposite angles formed when 2 lines or line segments intersect; the angle measures are congruent Volume space occupied by a 3D figure Supplementary angles 2 angles whose measures total 180 degrees Surface Area Sum of the area of each base and face of a 3D figure