# Circumcircle of a triangle Calculator

## Calculates the radius and area of the circumcircle of a triangle given the three sides.

 side a side b side c 6digit10digit14digit18digit22digit26digit30digit34digit38digit42digit46digit50digit circumradius r diameter φ circumcircle area Sc triangle area St area ratio Sc/St
 $\normal Circumcircle\ of\ a\ triangle\\\vspace{5}(1)\ circumcircle\ radius:\\\hspace{130} r={\large\frac{abc}{4\sqrt{s(s-a)(s-b)(s-c)}}}\\\hspace{230} s={\large\frac{a+b+c}{2}}\\(2)\ circumcircle\ area:\ Sc=\pi r^2\\\vspace{5}(3)\ triangle\ area:\ St=\sqrt{s(s-a)(s-b)(s-c)}\\$
Circumcircle of a triangle
 [1-6] /6 Disp-Num5103050100200
[1]  2018/12/07 12:01   Male / Under 20 years old / High-school/ University/ Grad student / A little /
Purpose of use
Sheer curiosity of triangles and circles
[2]  2018/06/27 20:58   Male / Under 20 years old / High-school/ University/ Grad student / Very /
Purpose of use
Verifying my work
[3]  2018/03/03 04:13   Male / Under 20 years old / Elementary school/ Junior high-school student / - /
Purpose of use
Comment/Request
[4]  2017/09/01 21:21   Male / Under 20 years old / High-school/ University/ Grad student / Very /
Purpose of use
work
Comment/Request
brilliant
[5]  2013/02/08 21:03   Male / Under 20 years old / High-school/ University/ Grad student / Very /
Purpose of use
learnt some formulas
[6]  2009/08/26 09:56   Male / 30 level / A teacher / Very /
Comment/Request
Good

Sending completion

To improve this 'Circumcircle of a triangle Calculator', please fill in questionnaire.
Male or Female ?
Male Female
Age
Under 20 years old 20 years old level 30 years old level
40 years old level 50 years old level 60 years old level or over
Occupation
Elementary school/ Junior high-school student
High-school/ University/ Grad student A homemaker An office worker / A public employee
Self-employed people An engineer A teacher / A researcher
A retired person Others
Useful?
Very Useful A little Not at All
Purpose of use?