# Triangle calculator VC

Please enter the coordinates of the three vertices

### Obtuse scalene triangle.

Sides: a = 7.21111025509   b = 5.09990195136   c = 3.16222776602

Area: T = 7
Perimeter: p = 15.47223997247
Semiperimeter: s = 7.73661998623

Angle ∠ A = α = 119.7454881297° = 119°44'42″ = 2.0989942441 rad
Angle ∠ B = β = 37.87549836511° = 37°52'30″ = 0.66110431689 rad
Angle ∠ C = γ = 22.3880135052° = 22°22'49″ = 0.39106070437 rad

Height: ha = 1.94114506868
Height: hb = 2.74656258919
Height: hc = 4.42771887242

Median: ma = 2.23660679775
Median: mb = 4.95497474683
Median: mc = 6.04215229868

Inradius: r = 0.90548370162
Circumradius: R = 4.15326976725

Vertex coordinates: A[1; 4] B[-2; 5] C[2; -1]
Centroid: CG[0.33333333333; 2.66766666667]
Coordinates of the circumscribed circle: U[0; 0]
Coordinates of the inscribed circle: I[1.16333618779; 0.90548370162]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 60.25551187031° = 60°15'18″ = 2.0989942441 rad
∠ B' = β' = 142.1255016349° = 142°7'30″ = 0.66110431689 rad
∠ C' = γ' = 157.6219864948° = 157°37'11″ = 0.39106070437 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.