Answers

2014-07-19T11:00:01+08:00
R = d/2
  = (30cm)/2
r = 15cm

SA = 2 \pi r (r+h)
     = 2 \pi (15cm) [15cm + 20cm]
     = (30 \pi )cm [35cm]
     = 1050 \pi cm^{2}
SA = 3927 cm^{2}

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2014-07-20T13:58:12+08:00
A = 2(3.14)²rh + 2(3.14)r²
R = 15cm
H = 20cm
A = 3298.67
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