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154 = πr²
154/π = r²
154/(22/7) = r²
(154x7)/22 = r²
49 = r²
7 = r
Luas krton yang diperlukan = L permukaan tabung
= 2Luas alas + Luas selimut
= 2πr² + 2πrt
= 2πr(r+t)
= 2(22/7)7(7+20)
= 44(7+20)
= 44(27)
= 1188cm²