Kolmnurga pindala on võimalik arvutada 
ka siseringjoone raadiuse ja 
kolmnurga ümbermõõdu kaudu. 

S=\frac{r×P}{2}

S=\frac{1.98×28.06}{2}= 27.78 cm²≈27.81 cm²

A = (2.92, -4.330719634618365)
B = (15.2, -1.5107196346183644)
C = (6.795874423882206, 1.0888739572334445)
t1, c, a, b = Polygon(A, B, C)
f = AngularBisector(A, B, C)
g = AngularBisector(B, C, A)
h = AngularBisector(C, A, B)
O = Intersect(f, g)
i = OrthogonalLine(O, a)
D = Intersect(i, a)
r = Segment(O, D)
kaugusOD = Distance(O, D)
d = Circle(O, D)
Punktt1_{1} = PointIn(t1)
Punktt1_{2} = PointIn(t1)
Punktt1_{3} = PointIn(t1)
Punktt1_{4} = PointIn(t1)
Punktt1 = PointIn(t1)
tekst3: "P=" + c + "+" + a + "+" + b + "=28.06 cm"