# Triangle calculator VC

Please enter the coordinates of the three vertices

### Obtuse scalene triangle.

Sides: a = 9.48768329805   b = 6.08327625303   c = 3.60655512755

Area: T = 4.5
Perimeter: p = 19.17551467863
Semiperimeter: s = 9.58875733931

Angle ∠ A = α = 155.7722254682° = 155°46'20″ = 2.71987387275 rad
Angle ∠ B = β = 15.25551187031° = 15°15'18″ = 0.26662520492 rad
Angle ∠ C = γ = 8.97326266149° = 8°58'21″ = 0.1576601877 rad

Height: ha = 0.94986832981
Height: hb = 1.48795908857
Height: hc = 2.4966150883

Median: ma = 1.58111388301
Median: mb = 6.5
Median: mc = 7.76220873481

Inradius: r = 0.46993575544
Circumradius: R = 11.55990272563

Vertex coordinates: A[0; -3] B[-2; 0] C[1; -9]
Centroid: CG[-0.33333333333; -4]
Coordinates of the circumscribed circle: U[0; 0]
Coordinates of the inscribed circle: I[1.72109776993; 0.46993575544]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 24.2287745318° = 24°13'40″ = 2.71987387275 rad
∠ B' = β' = 164.7454881297° = 164°44'42″ = 0.26662520492 rad
∠ C' = γ' = 171.0277373385° = 171°1'39″ = 0.1576601877 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.