kolsonjohanson
kolsonjohanson kolsonjohanson
  • 20-04-2018
  • Mathematics
contestada

What is the approximate perimeter of a semicircle with a radius of 9 mm?
Use π ⁢ = 3.14. Express your final answer to the nearest hundredth.

Respuesta :

jdoe0001 jdoe0001
  • 20-04-2018
[tex]\bf \textit{circumference of a semicircle}\\\\ C=\pi r~~ \begin{cases} r=radius\\ -----\\ r=9 \end{cases}\implies C=9\pi [/tex]
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geerky42
geerky42 geerky42
  • 20-04-2018
Perimeter of a semicircle would be half of circumference plus diameter.

So that would be P = πr + 2r

Now substitute r to 9 and we have 9π + 2·9 ≈ 9·3.14 + 18 = 46.26

Final answer: 46.26 mm
Answer Link

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