# Triangle calculator VC

Please enter the coordinates of the three vertices

### Obtuse scalene triangle.

Sides: a = 7.28801098893   b = 15.29770585408   c = 8.06222577483

Area: T = 4.5
Perimeter: p = 30.63994261784
Semiperimeter: s = 15.32197130892

Angle ∠ A = α = 4.18549161251° = 4°11'6″ = 0.07330405653 rad
Angle ∠ B = β = 171.1879620448° = 171°10'47″ = 2.98876479891 rad
Angle ∠ C = γ = 4.63554634269° = 4°38'8″ = 0.08109040992 rad

Height: ha = 1.23662450755
Height: hb = 0.58883484054
Height: hc = 1.11663126113

Median: ma = 11.67326175299
Median: mb = 0.70771067812
Median: mc = 11.28105141727

Inradius: r = 0.29437391826
Circumradius: R = 49.8880412544

Vertex coordinates: A[0; -9] B[1; -1] C[3; 6]
Centroid: CG[1.33333333333; -1.33333333333]
Coordinates of the circumscribed circle: U[0; 0]
Coordinates of the inscribed circle: I[-1.89329858432; 0.29437391826]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 175.8155083875° = 175°48'54″ = 0.07330405653 rad
∠ B' = β' = 8.8220379552° = 8°49'13″ = 2.98876479891 rad
∠ C' = γ' = 175.3654536573° = 175°21'52″ = 0.08109040992 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.