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63 Cards in this Set
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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
