Perimeter Websites
www-formula.com
Any geometric formula in just one click from the home page
4,289,671 
$ 240.00
math.com
Free math lessons and math homework help from basic math to algebra, geometry and beyond. Students, teachers, parents, and everyone can find solutions to their math problems...
No data $ 8.95
amathsdictionaryforkids.com
Interactive, animated maths dictionary with over 630 common math terms and math words explained in simple language with examples. Device friendly version with 950+ entries. Math...
191,099 $ 58,200.00
triangle-calculator.com
The calculator solves and draws any triangle from any three parameters like sides, angles, area, heights, perimeter, medians, inradius, etc.
176,005 $ 63,000.00