" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
4 x 3,14 x r² = 0,5024 cm²
12,56 x r² = 0,5024 cm²
0,5024 : 12,56 = 0,04
r² = 0,04
r = 0,2