Seudónimo Seudónimo
  • 02-08-2018
  • Mathematics
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I need help on this question plz

I need help on this question plz class=

Respuesta :

sqdancefan
sqdancefan sqdancefan
  • 13-08-2018

The curved dome has the area of half a sphere with radius 8 in. That is

... A = 2πr² = 2π(8 in)² = 128π in²

The lateral area of the cylinder is

... A = 2πrh = 2π(8 in)(7 in) = 112π in²

The area of the flat base is

... A = πr² = π(8 in)² = 64π in²

Then the total area of the figure is

... (128π + 112π + 64π) in² ≈ 304·3.14 in²

... = 954.56 in² . . . . matches the 2nd selection

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