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luas alas = 1256 cm²
π = 3,14
t = 48
ditanya : luas selimut =...............?
jawab :
Luas Alas = 1256
πr² = 1256
3,14.r² = 1256
r² = 1256/3,14
r² = 400
r = √400
r = 20 cm
Luas selimut = 2πrt
= 2 x 3,14 x 20 x 48
= 6028,8 cm²