###
perfect square

a square of a whole number

###
square root

one of the two equal factors of a number

###
radical sign

the symbol for square root.

###
scalene triangle

a triangle with no congruent sides

###
isosceles triangle

a triangle with at least two congruent sides

###
equilateral triangle

a triangle with three congruent sides

###
acute triangle

a triangle with all its angles measuring less than 90 degrees

###
obtuse triangle

an angle whose measure is greater than 90 degrees but less than 180 degrees

###
right triangle

a triangle containing a right angle

###
leg

in a right triangle, the sides that include the right angle; in an isosceles triangle, the pair of congruent sides

###
hypotenuse

in a right triangle, the side opposite the right angle

###
Pythogorean Theorem

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

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