anonymous
  • anonymous
Nina designed an arch made of wrought iron for the top of a mall entrance. The 11 segments between the two concentric semicircles are each 3 ft long. Find the total length of wrought iron used to make this structure. Round your answer to the nearest foot.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
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amistre64
  • amistre64
well, arc length = angle * radius; angle seems to be pi and radius is 10 on one and 13 on the other
amistre64
  • amistre64
then count the segments and times it by 3

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amistre64
  • amistre64
10pi + 13pi + 3(11) seems about right
anonymous
  • anonymous
how did you get the 13?
amistre64
  • amistre64
10 + 3 feet more for the space between them
amistre64
  • amistre64
|dw:1327255016852:dw|
anonymous
  • anonymous
but why do you need both 13 pi and 10pi?
amistre64
  • amistre64
you have 2 arches; one is an inner arch with a radius of 10; the other is an exterior arch with a radius of 13 and you got all these little 3 ft sections to keep them apart
amistre64
  • amistre64
the total amount of material has to be the inclusion of the total length
anonymous
  • anonymous
oh ok i get it know thank you!
amistre64
  • amistre64
youre welcome :)

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