皮100位！
Responding to lots of requests , to the Free version !
π = 3.1415926535...........
Do you know the circumference rate 100 digits?
Let's master the circle ratio.
Math is fun & cool ! Pi,Pi,Pi....
Remember 100 digits , you are a genius !

(NOW ON SALE)
・Hair Color Level Scale (2015.1.19/Jordan/No1)
・Hair Color Chart (Used in more than 90 countries worldwide)
・Reflectors (2015.4.3/Thailand/No5/iPad)
・Color Coordinator(2016.3.7/Kuwait/No2/iPad)
・Wine Color Chart (2014.9.21/Croatia/No1)
・ Scales Wad (2014.10.7/Lebanon/No1)
・Alphabet CAPITAL & lower case for Kids (2016.6.6/Singapore/No3)
・Constellations 88 Lessons for Kids (2014.9.6/Bulgaria/No2/iPad)
・Japanese Lesson (2016.7.1/Portugal/No3/iPad)
・Sushi Lesson (2016.3.3/Paraguay/No7)
.....etc
THANKS RANKING !