the external surface area of a hollow cylinder is 540π sq.cm. Its internal diameter is 16cm and height is 15cm. Find the total surface area.
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External surface area of cylinder = 540 Π cm²
2 Π R h = 540 Π cm²
Internal radius (r) = 16/2 = 8 cm
height (h) = 15 cm
2 x Π x R x h = 540 Π
2 x Π x R x 15 = 540 Π
= 540 Π x (1/2) x (1/Π) x (1/15)
= 270/(15)
R= 18
Total surface area = 2 Π (R + r) (R - r + h)
= 2 Π (18 + 8) (18 - 8 + 15)
= 2 Π (26) (25)
= 1300 Π cm²
Total surface area of the cylinder = 1300 Π cm
2 Π R h = 540 Π cm²
Internal radius (r) = 16/2 = 8 cm
height (h) = 15 cm
2 x Π x R x h = 540 Π
2 x Π x R x 15 = 540 Π
= 540 Π x (1/2) x (1/Π) x (1/15)
= 270/(15)
R= 18
Total surface area = 2 Π (R + r) (R - r + h)
= 2 Π (18 + 8) (18 - 8 + 15)
= 2 Π (26) (25)
= 1300 Π cm²
Total surface area of the cylinder = 1300 Π cm
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