Tentukan luas permukaan tabung yang mempunyai diameter 14 m dan garis pelukis 25 m!
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Diket
d = 14 m
r = ½d
= ½(14 m)
= 7 m
s = 25 m
Ditanya = Lp tabung..?
Jawab
Lp = 2πr (r + s)
= 2 × 22/7 × 7 m (7 + 25) m
= 44 m × 32 m
= 1.408 m²
semoga membantu