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An angle that measures more than 90 degrees and less than 180.
obtuse

A quadrilateral with two parallel sides
parallelogram

The sum of the lengths of the sides of a polygon.
perimeter Two polygons with the same area do not necessarily have the same perimeter.

Intersecting at a right angle. The altitude and base of a triangle.
perpendicular

An irrational number, represented by the symbol π,
approximately equal to 3.14,
which is equal to the ratio of the circumference of any circle to its diameter. The area of a circle equals πr^{2},^{ }and the circumference equals 2πr.
pi

A product obtained by multiplying a quantity by itself one or more times (e.g., the fifth power of 2 or 2^{5} is 32.
power

An integer greater than 1 that has no factors other than 1 and itself. The first ten prime numbers are 2,3,5,711,13,17,23,29, and 31. Notice that 2 is the only even one of these.
Prime number

The result of multiplication
product

A polyhedron having for its base a polygon and for faces triangles with a common vertex.
Pyramid

The rule that states, "For any right tiring, the sum of the squares of the legs is equal to the square of the hypotenuse"
Pythagorean theorem

A foursided polygon. Squares, rectangles, parallelograms, and trapezoids.
quadrilateral.

The result of division.
quotient

The symbol √, which by itself represents the square root. With the little number, it represents a higher root.
radical

The length of a line segment connecting the center and point on a circle. Also half the diameter.
radius

Having a place on the number line. For instance, π, because it has a location on the number line.
real

A pair of number whose product is 1. To get the _______ of a fraction, switch the numerator and denominator.
reciprocals

A quadrilateral with four right angles. Always a parallelogram, but not all parallelograms are these.
rectangle

A quadrilateral with four equal sides
rhombus

An angle measuring exactly 90°
right angle

A number that multiplied by itself a certain number of times will yield the given quantity. of 4, is 2
root

A triangle with sides of different lengths. 345 triangle
scalene triangel

A threedimensional figure
solid

Two angles whose measures add up to 180°
supplementary angles

A quadrilateral with two parallel sides and two non parallel sides.
trapezoid

A doughnutshaped surface generated by a circle rotated about an axis in its plane that does not intersect the circle.
torus

The amount of threedimensional space taken up by a three dimensional object.
volume

