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All Triangles=180 degrees Triangles Scalene No sides or angles are Equal Right Triangle One angle is 90 (a right angle) Triangles Isosceles 2 sides and angles are Equal Equilateral All sides and angles are Equal Acute Angle An angle LESS than 90 degrees Obtuse Angle An angle Greater than 90 degrees. Right Angle An angle that is EXACTLY 90 degrees Supplementary Angles Two angles whose measures have a sum of 180° Complimentary Angles Two angles whose measures have a sum of 90° Perpendicular Lines Two lines that intersect to form four right angles Intersecting Lines Two lines that cross at one point NEVER MEET Diameter: A line segment that passes through the circle and has endpoints on the circle Diameter Radius Radius: A line segment with one endpoint at the center of the circle and the other endpoint on the circle Place Value Chart Percents, Decimals, and Fractions 50% 25% 75% .25 .75 1 4 .50 1 2 3 4 Similar Figures: Figures with same shape, but NOT same size. Congruent Figures: Figures with the same size and shape Line of Symmetry A line that divides a shape EXACTLY in half. A polygon with four sides Polygon A closed plane figure formed by three or more line segments. A solid figure that has the shape of a round ball. All points are the same distance from the center Perimeter: The distance around a figure (add up all the sides) 2 3 Numerator (TOP NUMBER) Denominator (BOTTOM NUMBER) The smallest number, other than zero, that is a common multiple of two or more numbers Example: multiples of 6: 6, 12, 18, 24, 30, 36 multiples of 9: 9, 18, 27, 36, 45, 54 The LCM of 6 and 9 is 18 The greatest factor that two or more numbers have in common Example: 18: 1, 2, 3, 6, 9, 18 30: 1, 2, 3, 5, 6, 10, 15, 30 6 is the GCF of 18 and 30 Commutative Property The property that states that when the order of addends or factors is changed, the sum or product is the same Examples: 9+4=4+9 6x3=3x6 Associative Property The property that states that the way addends are grouped or factors are grouped does not change the sum or the product Examples: 12 + (5 + 9) = (12 + 5) + 9 (9 x 8) x 3 = 9 x (8 x 3) Add Words That Mean… Multiply Times Product of Of Twice ( 2 ) Altogether Plus Sum Total Increase More than Divide Quotient of How often Per How much for each? Subtract Minus Difference Decrease Less than Have left Fewer How many more Please Excuse My Dear Aunt Sally Parentheses Exponents ( ) 2 x ÷ + and Subtraction - Multiplication X and Division Addition 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79. 83, 89, 97, 101, 103, 107, 109, 113