Equilateral triangle vs circle

Find the area of an equilateral triangle inscribed in a circle of radius r = 9 cm. What percentage of the circle area does it occupy?

Correct answer:

S =  105.2221 cm2
p =  41.3497 %

Step-by-step explanation:

r=9 cm  a=3/3 r=3/3 9=9 3 cm15.5885 cm  S=43 a2=43 15.58852=105.2221 cm2
S1=π r2=3.1416 92254.469 cm2  p=100 S1S=100 254.469105.2221=41.3497%



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



avatar







Tips to related online calculators
Our percentage calculator will help you quickly calculate various typical tasks with percentages.
Pythagorean theorem is the base for the right triangle calculator.
See also our trigonometric triangle calculator.

 
We encourage you to watch this tutorial video on this math problem: video1   video2

Related math problems and questions: