Math Vocab2

English	Photos
diameter	a line segment/a special chord that passes through the center & touches 2 points on the circle (twice the length of the radius)
radius	Any line segment that connects the center of a circle to a point on a circle. 1/2 the length of the diameter.
chord	A line segment that connects two points on the circle
vertex	name for the endpoints of 2 rays that from an angle; name for the corner in a solid figure where 3 or more edges meet
central angle	An angle whose vertex is the center of the circle
obtuse angle	an angle between 90 and 180 degrees
acute angle	An angle less than 90 degrees
circumference	the distance around a circle (about 3 times the diameter)
radius	In the formula for the circumference of a circle (2πr), the r stands for the ____.
Ratio	a comparison of two numbers by division
Rate	A ratio that compares two quantities measured in different units
Proportions	is an equation that states that two ratios are equal
Polygons	a closed figure, all straight lines, and no intersecting lines
Triangles	any polygon with 3 sides and 3 angles
Quadrilateral	a four-sided polygon
parallelogram	a quadrilateral whose opposite sides are both parallel
trapezoid	a quadrilateral with two parallel sides
square	a plane rectangle with four equal sides and four right angles
Rectangle	a parallelogram with four right angles
Rhombus	a parallelogram with four equal sides
Vertical angles	a pair of opposite congruent angles formed by intersecting lines
Complementary	two angles that equal 90
Supplementary	sum of angles that equals 180 degrees
Congruent	figures that have the same size and same shape
similar	Figures that have the same shape but not necessarily the same size
tree diagram	a diagram used to show the total number of possible outcomes
counting principle	all possible outcomes (multiply the numbers to find.)
integers	All the whole number negative and positive no fractions or decimals.
whole numbers	All positive integers (including zero)
coefficient	number in front of a variable
variable	A symbol, usually a letter that stands for a number.
expression	the part of a number sentence that combines numbers and operations, but doesn't have an equal sign.
addend	something added to another
reciprocal	The inverse of a fraction; when multiplied by the original fraction, it results in a product that equals one
opposite number	a number that is the same distance from 0 on the number line as a given number but on the opposite side of 0. Adding a number and its's opposite alway equal zero.
exponent	number that represents the number of times the base is used as a factor
commutative	the order in which 2 numbers are added does not change the sum
associative	the grouping can change without changing the value
distributive	indicating separate members of a group, one at a time
identity	an equation that is true for every value of the variable
inverse property	The operation which undoes an operation - the opposite operation: subtraction is the inverse of addition, addition is the inverse of subtraction etc.
cross products	Cross multiply the means and extremes and put them equal to each other
equality	Given an equation you can add, subtract, multiply, and divide both sides by the same number and the equation is still true.
vertex	point where two line segments meet to form an angle
side	any one of the line segment that form a polygon
angle	two rays with a common endpoint
base	side or face on which an object lies on
height	the perpendicular distance from the base to the opposite vertex
perpendicular	intersecting at or forming right angles
right triangle	a triangle with an angle that measures 90 degrees
acute triangle	A triangle with three acute angles
obtuse triangle	a triangle with one obtuse angle
polygon	a closed plane figure formed by three or more line segments
straight angle	an angle of 180 degrees (a straight line)
list 3 kinds of angles	right angle, acute, obtuse
parallel line	lines that will never meet, no matter how long you stretch them (like railroad tracks)
quadrilaterals	a polygon with four sides
isosceles triangle	a triangle with two equal sides
scalene triangle	a triangle with no sides of equal length
equilateral triangle	a triangle with three equal sides
parallelogram	A quadrilateral with two pairs of parallel sides
trapezoid	a quadrilateral with two parallel sides
rhombus	A quadrilateral, all 4 sides the same length
Percent	a ratio that compares a number to 100
line segment	a part of a line with two endpoints
ray	part of a line with one endpoint