# Triangle calculator VC

Please enter the coordinates of the three vertices

### Obtuse scalene triangle.

Sides: a = 8.944427191   b = 13.34216640641   c = 5.09990195136

Area: T = 14
Perimeter: p = 27.38549554877
Semiperimeter: s = 13.69224777439

Angle ∠ A = α = 24.30545492659° = 24°18'16″ = 0.42441944079 rad
Angle ∠ B = β = 142.1255016349° = 142°7'30″ = 2.48105494847 rad
Angle ∠ C = γ = 13.57704343852° = 13°34'14″ = 0.23768487609 rad

Height: ha = 3.13304951685
Height: hb = 2.09986887292
Height: hc = 5.49112517839

Median: ma = 9.05553851381
Median: mb = 2.91554759474
Median: mc = 11.06879718106

Inradius: r = 1.02224592117
Circumradius: R = 10.86655982113

Vertex coordinates: A[-9; -6] B[-4; -5] C[4; -9]
Centroid: CG[-3; -6.66766666667]
Coordinates of the circumscribed circle: U[0; 0]
Coordinates of the inscribed circle: I[-1.3154590415; 1.02224592117]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 155.6955450734° = 155°41'44″ = 0.42441944079 rad
∠ B' = β' = 37.87549836511° = 37°52'30″ = 2.48105494847 rad
∠ C' = γ' = 166.4329565615° = 166°25'46″ = 0.23768487609 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.