Decagon 5145

Find the area of a regular decagon if its side is 10 cm in size.

Correct answer:

S =  769.4209 cm2

Step-by-step explanation:

n=10 s=10 cm p=s n=10 10=100 cm A=180/n=180/100.3142 rad a=s/(2 tan(A))=10/(2 tan0.3142)15.3884 S=a p/2=15.3884 100/2=769.4209 cm2

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

Tips for related online calculators
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: