Base two is also referred to as the binary number system.
In the decimal system we use 10 different digits (0 to 9) to represent numbers. However, all numbers in binary consist of a combination of only 2 different digits; a "0" and/or a "1".
All numbers can be represented using only these 2 digits.
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This refers to numbers written in base-2, base-3, etc. The lowest number that can be used as a base for such an "base n" calculation is 2. The first few numbers in binary are as follows (left: base-10; right: base 2): 0 = 0 1 = 1 2 = 10 3 = 11 4 = 100 As you can see, starting from the number 2, in base-2 it is written differently.
What is base in numbers
There are infinitely many numbers in each system, however base 10 uses 10 digits {0, 1, 2, 3, 4, 5, 6, 7, 8, 9} and binary uses 2 digits {0, 1}. The maximum digit is one less than the base.
To subtract 11 in base 2 from 100 in base 2, you first convert both numbers to decimal. 100 in base 2 is equal to 4 in decimal (12^2 + 02^1 + 02^0). Similarly, 11 in base 2 is equal to 3 in decimal (12^1 + 12^0). Subtracting 3 from 4 in decimal gives you 1 in decimal, which is equal to 1 in binary (12^0). Therefore, 100 in base 2 minus 11 in base 2 equals 1 in base 2.
The equation for the area of a triangle is (base*height)/2. So with your particular numbers you just plug them into the equation to obtain that (5*4)/2 = 20/2 = 10un^2