## 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

1. Hero Group Title

Do you have the formulas for Area of a Polygon already?

2. ErinWeeks Group Title

no i dont ! could you tell me the area

3. Hero Group Title

$A = \frac{Pa}{2}$

4. ErinWeeks Group Title

what is PA? what would i put there?

5. mathmate Group Title

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.

6. Hero Group Title

^What he said

7. ErinWeeks Group Title

so it would be B , 875 ?

8. mathmate Group Title

Sounds good to me. :)

9. Hero Group Title

I was just about to show her the long hard way of doing it.

10. Hero Group Title

Nice intercept @mathmate

11. ErinWeeks Group Title

thank you both !!

12. mathmate Group Title

Sorry @Hero for butting in. I think the question was on the proportionality of figures.

13. mathmate Group Title

yw! :)

14. Hero Group Title

It was on Area of a Regular Polygon as well

15. mathmate Group Title

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.

16. Hero Group Title

Yes, I know. I just said that it was the long way. Good job on saving time.

17. mathmate Group Title

Sorry pal for this time. Hope that won't happen again! :)

18. Hero Group Title

Okay bro