
Fact 
Category 
Date 

16 
The base of the binary system is 2. 
Science > Math 
08/12/08 

17 
The base of the decimal system is ten. 
Science > Math 
08/08/08 

18 
The base of the duodecimal system is 12. 
Science > Math 
01/31/09 

19 
The base of the quinary system is 5. 
Science > Math 
08/14/08 

20 
The base of the vigesimal is 20. 
Science > Math 
08/06/08 

21 
The hypotenuse is the longest side in a right triangle. 
Science > Math 
05/20/08 

22 
The imaginary unit, commonly referred to as "i", is the square root of negative one. 
Science > Math 
02/06/09 

23 
The Mayan number system is in base twenty. 
Science > Math 
12/06/09 

24 
The midpoint of a line is calculated with the equation M = (x1 + x2) /2, (y1 + y2) /2. 
Science > Math 
07/01/08 

25 
The natural logarithm is defined as a logarithm to base e. 
Science > Math 
05/24/08 

26 
The one hundredth digit of pi after the decimal point is nine. 
Science > Math 
06/08/08 

27 
The slope of a line is calculated using m=(y2y1) / (x2x1). 
Science > Math 
06/25/08 

28 
There are general formulas for solving polynomial equations of degree less than 5, using only addition, subtraction, multiplication, division, and root extraction, but no such formula exists for polynomials of degree 5 or higher. 
Science > Math 
10/31/08 

29 
Trigonometry is the study of the measurement of triangles. 
Science > Math 
09/12/08 

30 
Unlike in the real numbers and the complex numbers, multiplication in the quaternions is not commutative. 
Science > Math 
09/21/08 

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