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### 63 Cards in this Set

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• Back
 Geometry means "to measure the earth" Geometry involves measuring shapes. Angle two rays that share a common endpoint (vertex) Perpendicular lines lines that intersect to form a right angle. Parallel lines lines that never intersect Similar figures figures that have the same shape. Congruent figures figures that have the same shape and size. Intersecting lines lines that cross at some point. Plane is represented by a smooth, flat surgace that has no thickness and extends indefinitely in all directions. ~ is the symbol for similar Polygon a simple, closed figure made up of line segments. Triangle a polygon with 3 sides Quadrilateral a polygon with 4 sides Pentagon a polygon with 5 sides Hexagon a polygon with 6 sides Heptagon a polygon with 7 sides Octagon a polygon with 8 sides Vertices points where the sides of polygons meet. Parallelogram a quadrilateral having opposite sides of parallel. Numerator the top number of a fraction. Denominator the bottom number of a fraction Equivalent fractions fractions which have the same value. Perimeter the distance around a polygon. A number is divisible by 10 if it ends in 0. A number is divisible by 5 if it ends in 0 or 5. A number is divisible by 3 if the sum of its digits is divisible by 3. (for 27, 2+7=9 and 9 is div. by 3.) 1 foot = 12 inches 1 yard = 3 feet 1 mile = 5,280 feet 1 meter = 100 centimeters (just like 1 dollar = 100 cents) 1 kilometer = 1000 meters (just like Y2K = the year 2000) Mode the number that appears the most often Median the middle number Mean the average Area of a triangle = 1/2 bh (b is base and h is height) Area of a rectangle = bh Arae of a parallelogram = bh Ratio a comparison of two numbers. Rate a ratio Equivalent equations equations having the same solution. Rectangle a quacrilateral having opposite sides parallel and 4 right angles. Right angle a 90 degree angle. Straight angle a 180 degree angle (a straight line). Square a quadrilateral having opposite sides parallel and 4 right angles and all sides equal. Rhombus a quadrilateral with opposite sides parallel and all sides equal. Trapezoid a quadrilateral with only one pair of parallel sides. Acute angle an angle of less than 90 degrees. Obtuse angle an angle of more than 90 degrees and less than 180 degrees. Isosceles triangle a triangle having 2 sides =. Scalene triangle a triangle having no sides =. Equilateral triangle a triangle having all 3 sides =. Sum the answer to an addition problem. Difference the answer to a subtraction problem. Product the answer to a multiplication problem. Quotient the answer to a division problem. Proper fraction a fraction representing a number less than one. (like 1/2, 3/4, 6/9, etc.) Improper fraction a fraction representing a number more than one. (like 6/3, 3/2, 8/3, etc.) Addends the numbers being added. Factors the numbers being multiplied. Prime number a whole number greater than 1 whose only whole number factors are 1 and itself. Composite number a whole number greater than 1 which is not prime. The product of any number and its reciprocal is ? One The only number which does not have a reciprocal is ? zero Dividing by 2 is the same as multiplying by ? 1/2