Grey: Approximation by gridding
I
a
:
Red: Largest interior circle around centroid
I
r
:
I
a
/I
r
:
%
Green: Circle around centroid equal in area to triangle
I
g
:
I
a
/I
g
:
%
Blue: Bounding circle around centroid
I
b
:
I
a
/I
b
:
%
Largest angle of triangle (at mouse pointer)
θ
ACB
:
°