# 19 23 30 triangle

### Obtuse scalene triangle.

Sides: a = 19   b = 23   c = 30

Area: T = 218.4865697472
Perimeter: p = 72
Semiperimeter: s = 36

Angle ∠ A = α = 39.29334109792° = 39°17'36″ = 0.68657993959 rad
Angle ∠ B = β = 50.05110165987° = 50°3'4″ = 0.87435550336 rad
Angle ∠ C = γ = 90.65655724222° = 90°39'20″ = 1.5822238224 rad

Height: ha = 22.99884944708
Height: hb = 18.99987563019
Height: hc = 14.56657131648

Median: ma = 24.98549954973
Median: mb = 22.32215142855
Median: mc = 14.83223969742

Inradius: r = 6.0699047152
Circumradius: R = 15.00109819312

Vertex coordinates: A[30; 0] B[0; 0] C[12.2; 14.56657131648]
Centroid: CG[14.06766666667; 4.85552377216]
Coordinates of the circumscribed circle: U[15; -0.17216359489]
Coordinates of the inscribed circle: I[13; 6.0699047152]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 140.7076589021° = 140°42'24″ = 0.68657993959 rad
∠ B' = β' = 129.9498983401° = 129°56'56″ = 0.87435550336 rad
∠ C' = γ' = 89.34444275778° = 89°20'40″ = 1.5822238224 rad

# 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 ### 8. Calculation of medians #### Look also our friend's collection of math examples and problems:

See more informations about triangles or more information about solving triangles.