# Triangle calculator VC

Please enter the coordinates of the three vertices

### Obtuse scalene triangle.

Sides: a = 5.38551648071   b = 8.48552813742   c = 4.12331056256

Area: T = 9
Perimeter: p = 17.9943551807
Semiperimeter: s = 8.99767759035

Angle ∠ A = α = 30.96437565321° = 30°57'50″ = 0.54404195003 rad
Angle ∠ B = β = 125.8387652954° = 125°50'16″ = 2.1966281367 rad
Angle ∠ C = γ = 23.19985905136° = 23°11'55″ = 0.40548917863 rad

Height: ha = 3.34325160872
Height: hb = 2.12113203436
Height: hc = 4.36656412507

Median: ma = 6.10332778079
Median: mb = 2.23660679775
Median: mc = 6.80107352544

Inradius: r = 11.0003583613
Circumradius: R = 5.23334394894

Vertex coordinates: A[2; 2] B[1; -2] C[-4; -4]
Centroid: CG[-0.33333333333; -1.33333333333]
Coordinates of the circumscribed circle: U[0; 0]
Coordinates of the inscribed circle: I[-0.72224810387; 11.0003583613]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 149.0366243468° = 149°2'10″ = 0.54404195003 rad
∠ B' = β' = 54.16223470457° = 54°9'44″ = 2.1966281367 rad
∠ C' = γ' = 156.8011409486° = 156°48'5″ = 0.40548917863 rad

# How did we calculate this triangle?

### 1. We compute side a from coordinates using the Pythagorean theorem ### 2. We compute side b from coordinates using the Pythagorean theorem ### 3. We compute side c from coordinates using the Pythagorean theorem 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. ### 4. The triangle circumference is the sum of the lengths of its three sides ### 5. Semiperimeter of the triangle ### 6. The triangle area using Heron's formula ### 7. Calculate the heights of the triangle from its area. ### 8. Calculation of the inner angles of the triangle using a Law of Cosines ### 9. Inradius ### 10. Circumradius ### 11. 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.