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lp : 2 x 22per7 x 7 ( 14+7) = 924.
Dit : ∞ Volume tabung ... ? ∞ Luas permukaan tabung ... ?
Jawaban :
∞ Volume tabung = πr²t
= 22/7 × 7 × 7 × 14 = 22 × 7 × 14
= 154 × 14 = 2156 cm³.
∞ Luas permukaan tabung = 2πr(r+t)
= 2 × 22/7 × 7 × ( 7 + 14 )
= 2 × 22 × 21 = 44 × 21 = 924 cm².