How to determine where a line intersects a plane

Posted 6.2 years ago.

Suppose you have a line defined by two 3-dimensional points and a plane defined by three 3-dimension...

Python Script to Detect a Repeating Decimal

Posted 6.2 years ago.

Remember doing long division as a 2nd grader? And if you found that the decimal started to repeat, y...

10,000 Digits of e

Posted 6.3 years ago.

e = 2.7182818284 5904523536 0287471352 6624977572 4709369995 9574966967 6277240766 3035354759 457138...

Calculating Base 10 Logarithms in Your Head

Posted 7 years ago.

Calculating base 10 logarithms in your head on the fly is a lot easier than you may think. It is sim...

Checking a Number for Primeness

Posted 7 years ago.

The Pen-and-Paperless version!
The following is roughly my thought processes when I try to check to ...

Typing Pi Game

Posted 7 years ago.

Type pi as fast as you can!Click in the text box below and start typing pi.
Can you beat Blake? Ty...

Divisibility Rules for Arbitrary Divisors

Posted 7 years ago.

It's rather obvious when a number is divisible by 2 or 5, and some of you probably know how to tell ...

10,000 Digits of Pi

Posted 7 years ago.

= 3.
1415926535 8979323846 2643383279 5028841971 6939937510 5820974944 5923078164 0628620899 862803...

Counting Terminating Zeros in a Factorial

Posted 7 years ago.

Ever notice how large factorials always end in a ton of zeros? If not, take a look at 999 Factorial ...

Determining if a Point is in a Triangle

Posted 7 years ago.

Suppose you have 3 points in 2D space that represent a triangle. Now suppose you have another point ...

Converting Repeating Decimals Into Fractions

Posted 7 years ago.

It's fairly easy to take a fraction and turn it into a repeating decimal by hand. This is simple div...