anonymous
  • anonymous
Dana plans to cover this model of a half moon completely with silver foil. ( imagine a semicircle with a radius of 8 cm) How many square centimeters of silver foil would Dana need to cover the model completely?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
I got 402 but it is wrong
anonymous
  • anonymous
100,48
anonymous
  • anonymous
circle area:\[A=\pi*r ^{2}\] since it is half moon: devide by 2

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anonymous
  • anonymous
is that 100.48?
anonymous
  • anonymous
taking value for pi 3,14, yes
anonymous
  • anonymous
but it said... cover the entire thing? the outside not the volume
anonymous
  • anonymous
i understand it like if you would cut the chape of half moon from sheet of paper, and cover one of it's sides
anonymous
  • anonymous
gotcha. can you look at this next one as well
jim_thompson5910
  • jim_thompson5910
SA = (half of outside) + (inside circular surface) SA = (1/2)*pi*r^2 + pi*r^2 SA = (1/2)*4*pi*8^2 + pi*8^2 SA = 128*pi + 64*pi SA = 192*pi So the exact surface area is 192pi square cm and it approximates to 603.18578948924 square cm (use a calculator)

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