12 terms

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