Add units and use built-in $PI.
Added solutions (adapted from eliminated duplicate problems)
Make sure the function is not constant.
Added clarification:  sides --> sides of the base
Added link for interval notation.
Fixed broken link
Miscategorized.
Fixed an incorrect answer, and minor input improvements
Converted to MathObjects; made it pickier about absolute values
Added randomness and converted to MathObjects
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge pull request #95 from paulvojta/master

Miscellaneous changes