L. Tabung tnp tutup= phi × r (r + 2t) = 3,14 × 10 (10+2×5)=31,4 (10+10)=31,4× 20=62,8 cm²
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=π .r (r + 2.t)
= 3,14 . 10 . (10 + 5)
= 31,4 . 15
= 471 cm²
L. Tabung tnp tutup= phi × r (r + 2t)
= 3,14 × 10 (10+2×5)
=31,4 (10+10)
=31,4× 20
=62,8 cm²