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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