###
abscissa

x-coordinate; 1st coordinate in an ordered pair

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converse

the reverse parts of the Pythagorean Theorem

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coordinate plane

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

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hypotenuse

the side opposite the right angle in a right triangle

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irrational number

a number that cannot be expressed as a fraction

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legs

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

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ordered pair

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

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ordinate

the second number of an ordered pair

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origin

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

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perfect square

a number that is the square of an integer

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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

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quadrants

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

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radical sign

the symbol used to indicate a non-negative square root

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real number

any rational or irrational number

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square root

a number which when multiplied by itself gives the original number

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x-axis

the horizontal number line that helps to form the coordinate plane

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x-coordinate

the first number of an ordered pair

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y-axis

the vertical number line that helps to form the coordinate plane

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y-coordinate

the second number of an ordered pair

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