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### 46 Cards in this Set

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 acute angle An angle of less than 90 degrees. Right Angle An angle of 90 degrees. Obtuse Angle An angle of more than 90 degrees. Straight Angle An angle that measures 180 degrees. Angle Two rays with a common end point. Vertex On an angle, the endpoint of the rays forming the angle. (The common endpoints) Ray Has one endpoint and extends without end in one direction. Complementary Angles Two angles whose measures add up to 90 degrees. 20 degrees + 70 degrees = 90 degrees 35 degrees + 55 degrees = 90 degrees Supplementary Angles Two angles whose measures add up to 180 degrees. 80 degrees + 100 degrees = 180 degrees 35 degrees + 145 degrees = 180 degrees Congruent Angles Angles that have equal measures. Angle bisector A ray bisecting an angle. Angle bisector A ray bisecting an angle. Plane A flat surface that extends forever. Parallel lines Lines in a plane that never meet. _____________________ _____________________ Transversals Lines that intersect two or more parallel lines. Perpendicular Lines, rays,or line segments that intersect at right angles. Quadrilateral A 4 sided polygon. polygon A geometric figure with at least 3 three sides. parallelogram A quadrilateral with parallel and congruent opposite sides. Square/Rectangle/Rhombus Rhombuses A parallelogram with all sides congruent. (4 congruent sides) Trapezoid A quadrilateral with only one pair of parallel sides. Square A quadrilateral with four congruent sides and four right angles. Also called a parallelogram, rectangle and rhombus. Rectangle A quadrilateral that has four right angles. Also called a parallelogram. Equilateral Triangle A triangle whose sides are all the same length. Acute Triangle A triangle with three acute angles. Obtuse Triangle A triangle with one obtuse angle (more than 90 degrees and less than 180 degrees). Scalene Triangle A triangle with no congruent sides. Isosceles Triangle A triangle with at least two congruent sides. Name the three triangles when classified by their sides? 1. Scalene 2. Isosceles 3. Equilateral Name the four triangles when classified by their angles? 1. Acute 2. Obtuse 3. Straight 4. Right Pentagon A polygon with 5 sides. Triangle A polygon with three sides. Hexagon A polygon with 6 sides. Heptagon A polygon with 7 sides. Octogon A polygon with 8 sides. Decagon A polugon with 10 sides. Regular Polygon All of the sides and all of the angles are congruent. Examples: square and equilateral triangle What is the formula for finding the sum of the measures of any polygon? (Number of sides - 2)x 180 = ____degrees Example of octagon: (8 sides - 2)x 180 = 1080 degrees Perimeter The distance around the outside of a figure. Area What is the formula used to figure out the area of a two-dimentional figure? The number of square units to cover the a figure. Area = base x height Perfect Square is the square of a whole number. Example: 16 = 4² or 49 = 7² Square Root The length of the side of a square with an area equal to a given number. Example: 5 is the square root of 25 What is the formula for anrea of a triangle? Area = ½ bh Formula for athe area of a Parallelogram. Area = bh **Remember the height isn't always a side. Formula of a Trapezoid. Area = ½ h (b1 + b2) Who is the best math teacher? You are if you take your time and practice.