N-gon II

What is the side length of the regular 9-gon circumscribed circle of radius 13 cm?

Correct answer:

a =  9.46 cm

Step-by-step explanation:

n=9 r=13 α=nπ=93.14160.3491 rad tan α = (a/2) : r  a=2 r tanα=2 13 tan0.3491=9.46 cm



Did you find an error or inaccuracy? Feel free to write us. Thank you!







Tips for related online calculators
Do you want to convert length units?
Do you want to round the number?
See also our right triangle calculator.
See also our trigonometric triangle calculator.

You need to know the following knowledge to solve this word math problem:


 
We encourage you to watch this tutorial video on this math problem: video1

Related math problems and questions: