# Triangle calculator VC

Please enter the coordinates of the three vertices

### Obtuse scalene triangle.

Sides: a = 4.12331056256   b = 6.32545553203   c = 7.81102496759

Area: T = 13
Perimeter: p = 18.25879106219
Semiperimeter: s = 9.12989553109

Angle ∠ A = α = 31.75994800848° = 31°45'34″ = 0.55443074962 rad
Angle ∠ B = β = 53.84218145602° = 53°50'31″ = 0.94397169393 rad
Angle ∠ C = γ = 94.3998705355° = 94°23'55″ = 1.64875682181 rad

Height: ha = 6.30659262509
Height: hb = 4.11109609582
Height: hc = 3.32989588783

Median: ma = 6.80107352544
Median: mb = 5.38551648071
Median: mc = 3.64400549446

Inradius: r = 1.42440402716
Circumradius: R = 3.9176661421

Vertex coordinates: A[-4; 3] B[1; -3] C[2; 1]
Centroid: CG[-0.33333333333; 0.33333333333]
Coordinates of the circumscribed circle: U[0; 0]
Coordinates of the inscribed circle: I[1.04106448138; 1.42440402716]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 148.2410519915° = 148°14'26″ = 0.55443074962 rad
∠ B' = β' = 126.158818544° = 126°9'29″ = 0.94397169393 rad
∠ C' = γ' = 85.6011294645° = 85°36'5″ = 1.64875682181 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.