Defintion  Word  % Correct 

Fivesided polygon  Pentagon  93%

Number that has no factors besides itself and one  {Prime} number  91%

Threedimensional version of a circle  Sphere  89%

Angle of less than 90 degrees  {Acute} angle  86%

Opposite of concave  Convex  85%

The bottom number in a fraction  Denominator  80%

The longest side of a right triangle  Hypotenuse  74%

Quantity that represents both a speed and a direction  Velocity  72%

Ratio of a circle's circumference to its diameter  Pi  69%

Type of average; the most common value in a set  Mode  66%

What this symbol represents: ∑  Summation  65%

Square roots of negative numbers  {Imaginary} numbers  54%

Concept represented by the ! symbol  Factorial  51%

Triangle in which all sides have different lengths  Scalene  48%

Number that cannot be expressed as a fraction of two integers  {Irrational} number  42%

10 to the 100th power  Googol  41%

Point where lines meet in a polygon  Vertex  40%

Twodimensional version of a line  Plane  30%

The set of positive integers  {Natural} numbers  25%

Tetrahedrons and Dodecahedrons are types of this  Polyhedron  15%
