9 18 23 triangle
Obtuse scalene triangle.
Sides: a = 9 b = 18 c = 23Area: T = 74.83331477355
Perimeter: p = 50
Semiperimeter: s = 25
Angle ∠ A = α = 21.19331307973° = 21°11'35″ = 0.37698899112 rad
Angle ∠ B = β = 46.30548463945° = 46°18'17″ = 0.80881720292 rad
Angle ∠ C = γ = 112.5022022808° = 112°30'7″ = 1.96435307132 rad
Height: ha = 16.63295883857
Height: hb = 8.31547941928
Height: hc = 6.50772302379
Median: ma = 20.15656443707
Median: mb = 14.96766295471
Median: mc = 8.38215273071
Inradius: r = 2.99333259094
Circumradius: R = 12.44876923421
Vertex coordinates: A[23; 0] B[0; 0] C[6.21773913043; 6.50772302379]
Centroid: CG[9.73991304348; 2.1699076746]
Coordinates of the circumscribed circle: U[11.5; -4.76439316371]
Coordinates of the inscribed circle: I[7; 2.99333259094]
Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 158.8076869203° = 158°48'25″ = 0.37698899112 rad
∠ B' = β' = 133.6955153606° = 133°41'43″ = 0.80881720292 rad
∠ C' = γ' = 67.49879771918° = 67°29'53″ = 1.96435307132 rad
Calculate another triangle
How did we calculate this triangle?
Now we know the lengths of all three sides of the triangle and the triangle is uniquely determined. Next we calculate another its characteristics - same procedure as calculation of the triangle from the known three sides SSS.
1. The triangle circumference is the sum of the lengths of its three sides

2. Semiperimeter of the triangle

3. The triangle area using Heron's formula

4. Calculate the heights of the triangle from its area.

5. Calculation of the inner angles of the triangle using a Law of Cosines

6. Inradius

7. Circumradius
