" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
2..r.t : 4..r² => t tabung = 2.r
2..r.2.r : 4.r²
4..r² : 4..r
1 : 1
80 : x
x = 80 cm²