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abscissa

x-coordinate; 1st coordinate in an ordered pair

converse

the reverse parts of the Pythagorean Theorem

coordinate plane

a plane in which a horizontal number line and a verical number line intersect

hypotenuse

the side opposite the right angle in a right triangle

irrational number

a number that cannot be expressed as a fraction

legs

the two sides of a right triangle that form the right trangle

ordered pair

A pair of numbers that can be used to locate a point on a coordinate plane

ordinate

the second number of an ordered pair

origin

the intersection of the y-axis and the x-axis on a coordinate plane

perfect square

a number that is the square of an integer

Pythagorean Theorem

in any right triangle, the sum of the squares of the lengths of the legs is equal to the square of the length of the hypotenuse

quadrants

four regions into which a coordinate plane is divided by the x-axis and the y-axis

radical sign

the symbol used to indicate a non-negative square root

real number

any rational or irrational number

square root

a number which when multiplied by itself gives the original number

x-axis

the horizontal number line that helps to form the coordinate plane

x-coordinate

the first number of an ordered pair

y-axis

the vertical number line that helps to form the coordinate plane

y-coordinate

the second number of an ordered pair