###
irrational number

any number that cannot be written as a quotient of integers; √2, ⁵√7, π

###
isosceles triangle

a triangle that has at least two sides of equal length

###
kilometer

metric unit of measurement equal to 1000 meters

###
lateral surface area

the total area of the 'sides' of a geometric solid

###
lead coefficient

of a polynomial, the coefficient of the term with the greatest exponent

###
least common multiple

the smallest number that can be divided evenly by each of a given set of numbers

###
length

the distance between two designated points in a geometric figure

###
like terms

terms that have the same variables in the same form or in equivalent forms so that the terms represent the same number regardless of the nonzero values assigned the variables

###
line

in mathematics, a straight curve that has no width and no end

###
line segment

a part of a line that consists of two endpoints and all points between the endpoints

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