ECS6th math vocab

absolute value

distance of a # from 0 on a #line; shown by l#l

area

# of square units needed to cover a given surface

difference

result when 1 # is subtracted from another

equation

mathematical sentence that shows that 2 expressions are equivalent

integers

set of all whole #'s and their opposites

mean

sum of the items in a set of data divided by the number of items in the set; also called average

median

middle # or the mean of the 2 #'s in an ordered sit of data

mode

# or #'s that occur most frequently in a set of data; when all #'s occur w/ the same frequency; we say there is no ______

origin

point where the x-axis & the y-axis intersect on the coordinate plane

percent

ratio comparing a number to 100

perimeter

distance around a polygon

perpendicular

lines that intersect to form right angles

pi

ratio of the circumference of a circle to the length of its diameter

product

result when 2 or more #'s are multiplied

quotient

result when 1 # is divided by another

range

difference between the greatest & the least values in a data set

reciprocal

1 of 2 #'s whose product is 1

ratio

comparison of 2 quantities by division

skew

lines that lie in different planes that are neither parallel nor intersecting

sum

result when 2 or more #'s are added

quadrilateral

4-sided polygon

regular

polygon w/ congruent sides and angles

irregular

not all sides and angles are congruent

acute triangle

triangle w/ all angles measuring less than 90degrees

right triangle

triangle w/ 1 right angle

obtuse triangle

triangle w/ 1 obtuse angle

equilateral triangle

triangle w/ all congruent sides

isosceles triangle

triangle w/ at least 2 congruent sides

scalene triangle

triangle w/ no congruent sides

A=lw

area of a rectangle

A=1/2bh

area of a triangle

A=pi r square

area of a circle

A=bh

area of parallelogram

V=lwh

volume of a rectangular prism

C=pi d

circumference of a circle

180 degrees

degrees in 1 triangle

isolate the variable

inverse operations

goal when solving equations

how do we do that?

22/7 or 3.14

approximations for pi