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KimJaFo
 one year ago
Jason designed an arch made of wrought iron for the top of a mall entrance. The 11 segments
between the two concentric circles are each 1.25 m long. Find the total length of wrought iron
used to make the structure. Round the answer to the nearest meter. Show your work.
I need some hwlp with this, Ill try and post the picture in the comments
KimJaFo
 one year ago
Jason designed an arch made of wrought iron for the top of a mall entrance. The 11 segments between the two concentric circles are each 1.25 m long. Find the total length of wrought iron used to make the structure. Round the answer to the nearest meter. Show your work. I need some hwlp with this, Ill try and post the picture in the comments

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KimJaFo
 one year ago
Best ResponseYou've already chosen the best response.0@jagr2713 Could you help?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so we have 11 segments of 1.25 m each a semicircle with a diameter of 15 m and a semicircle with diameter (15  1.25  1.25) mdw:1438747266213:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0let's just add up the lengths. The circumference of a circles is πd, so for a semicircle it's \[C=\frac{ \pi d }{ 2 }\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Find the circumference for the 15 m semicircle using that formula

KimJaFo
 one year ago
Best ResponseYou've already chosen the best response.0So, the formula, once I plug in everything, would be C = pi15/2?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yes, but we write 15pi/2. Then do the same with the smaller semicircle

KimJaFo
 one year ago
Best ResponseYou've already chosen the best response.0What do you mean? I'm kinda getting a lil confused. Sorry ''

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0they're asking for the total length of all the lines/curves in the picture. 15π/2 is just the top semicircle. We also have to account for the bottom semicircle and all 11 line segments between them.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Does that make sense?

KimJaFo
 one year ago
Best ResponseYou've already chosen the best response.0A little bit, let me try it.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0to find the diameter of the smaller circle, subtract the 1.25 m on each end from the diameter of the larger. d = 15  2(1.25) = 12.5 m So use 12.5 in the circumference formula to get the length of this part

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0C = πd/2 where d = 12.5

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1438748775575:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0The last thing you have to find is the length of the segments. There are 11 and the are each 1.25 m. What's the total length?

KimJaFo
 one year ago
Best ResponseYou've already chosen the best response.0I think I got it, thank you
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