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junior college 2 | H1 Maths
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h = 16000/r²
Total surface area,
S = Curved surfaced area + 2 x area of circular base (top and bottom same)
S = 2πrh + 2πr²
S = 2πr(16000/r²) + 2πr²
S = 32000π/r + 2πr²
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Remember that dimensions are positive, ignore all negative values of r.
Thrrefore curve of S is in 1st quadrant