" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
1/3.phi.r².t : 1/3.phi.r².t = 16 : 9
12² : r² = 16 : 9
144/r² = 16/9
16.r² = 9 . 144
16.r² = 1296
r² = 1296 : 81
r² = 81
r = √81
r = 9 cm