" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2025 KUDO.TIPS - All rights reserved.
126 π = 2 x π x r x 10,5
126 = 21 x r
r = 126 : 21
r = 6 cm
Luas alas tabung = πr²
= 3,14 x 6 x 6
= 113,04 cm²
atau
= πr²
= π x 6 x 6
= 36π cm²