Question

The diameter of a cylinder is 28 cm and it's height is 40cm. Find the curved surface area and total surface of the cylinder.
$2\pi + 2\pi(r2 - r2)$

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Answer 1

Answer:

Diameter of the base (d) = 28 cm

therefore Radius of the base (r) = 28 over 2 c m equals 14 space c m

Height (h) = 21 cm

(i) Curved surface area = 2straight pirh

equals 2 cross times 22 over 7 cross times 14 cross times 21 equals 1848 space c m squared

(ii) Total surface area = 2 πr open parentheses straight h plus straight r close parentheses

equals 2 cross times 22 over 7 cross times 14 cross times open parentheses 21 plus 14 close parentheses equals 2 cross times 22 over 7 cross times 14 cross times 35 equals 3080 space c m squared

(iii) Volume = �r squared straight h

equals 22 over 7 cross times 14 squared cross times 21 equals 12936 space c m cubed