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ErinWeeks Group Title

The area of a regular octagon is 35 cm2. What is the area of a regular octagon with sides five times as long? A. 625 cm2 B. 875 cm2 C. 175 cm2 D. 245 cm2

  • one year ago
  • one year ago

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  1. Hero Group Title
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    Do you have the formulas for Area of a Polygon already?

    • one year ago
  2. ErinWeeks Group Title
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    no i dont ! could you tell me the area

    • one year ago
  3. Hero Group Title
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    \[A = \frac{Pa}{2}\]

    • one year ago
  4. ErinWeeks Group Title
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    what is PA? what would i put there?

    • one year ago
  5. mathmate Group Title
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    Hint: Area of similar polygons are proportional to the square of the linear dimensions (such as a side). A polygon with a side 5 times as long has an area of 5^2=25 times the smaller polygon.

    • one year ago
  6. Hero Group Title
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    ^What he said

    • one year ago
  7. ErinWeeks Group Title
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    so it would be B , 875 ?

    • one year ago
  8. mathmate Group Title
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    Sounds good to me. :)

    • one year ago
  9. Hero Group Title
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    I was just about to show her the long hard way of doing it.

    • one year ago
  10. Hero Group Title
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    Nice intercept @mathmate

    • one year ago
  11. ErinWeeks Group Title
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    thank you both !!

    • one year ago
  12. mathmate Group Title
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    Sorry @Hero for butting in. I think the question was on the proportionality of figures.

    • one year ago
  13. mathmate Group Title
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    yw! :)

    • one year ago
  14. Hero Group Title
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    It was on Area of a Regular Polygon as well

    • one year ago
  15. mathmate Group Title
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    It would definitely been beneficial to learn how to calculate the apothem and the length of the side given the area and number of sides. It would be a little long though.

    • one year ago
  16. Hero Group Title
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    Yes, I know. I just said that it was the long way. Good job on saving time.

    • one year ago
  17. mathmate Group Title
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    Sorry pal for this time. Hope that won't happen again! :)

    • one year ago
  18. Hero Group Title
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    Okay bro

    • one year ago
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