How to determine where a line intersects a plane

Posted 6.9 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 7 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 7 years ago.

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

Calculating Base 10 Logarithms in Your Head

Posted 7.7 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 7.7 years ago.

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

Typing Pi Game

Posted 7.7 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 7.7 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 7.7 years ago.

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

Counting Terminating Zeros in a Factorial

Posted 7.7 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 7.7 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 7.8 years ago.

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