## stupidinmath one year ago Help me continue. topic: circumference, polygons..

1. stupidinmath

Find the circumference of the circle inscribed in a regular hexagon with sides 18cm long.

2. stupidinmath

I should find the radius... how? |dw:1389280808018:dw|

3. stupidinmath

ugh. i dont know. help

4. SolomonZelman

|dw:1389281105829:dw|

5. SolomonZelman

the proportions of any 30-6090 degree triangle, are |dw:1389281244706:dw|

6. SolomonZelman

hypotenuse is twice the smaller leg, and half of the hypotenuse is the radius. and then use \[C=2πr~~~~~~~~~or~~~~~~~~~~~~~~C=πd\] (Because d=2r )

7. stupidinmath

oh, thank you soo soo much! :)

8. SolomonZelman

Anytime, also if you ever see |dw:1389281509527:dw| for 45 45 90 degree triangle... you welcome!

9. stupidinmath

will remember that. thanks again :))

10. SolomonZelman

Tell me what you et just in case, to make sure you are correct.

11. SolomonZelman

I meant get, not et.

12. stupidinmath

I got 113.10 approximately :) did I get it right? @SolomonZelman