# Triangle calculator SSS - result

Please enter the triangle sides:

### Acute scalene triangle.

Sides: a = 8   b = 12   c = 13

Area: T = 46.99993351017
Perimeter: p = 33
Semiperimeter: s = 16.5

Angle ∠ A = α = 37.05331475504° = 37°3'11″ = 0.6476699423 rad
Angle ∠ B = β = 64.66766127554° = 64°40' = 1.12986453087 rad
Angle ∠ C = γ = 78.28802396942° = 78°16'49″ = 1.36662479219 rad

Height: ha = 11.75498337754
Height: hb = 7.83332225169
Height: hc = 7.23106669387

Median: ma = 11.85332695911
Median: mb = 8.97221792225
Median: mc = 7.85881168228

Inradius: r = 2.84884445516
Circumradius: R = 6.63883917842

Vertex coordinates: A[13; 0] B[0; 0] C[3.42330769231; 7.23106669387]
Centroid: CG[5.47443589744; 2.41102223129]
Coordinates of the circumscribed circle: U[6.5; 1.34884233312]
Coordinates of the inscribed circle: I[4.5; 2.84884445516]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 142.947685245° = 142°56'49″ = 0.6476699423 rad
∠ B' = β' = 115.3333387245° = 115°20' = 1.12986453087 rad
∠ C' = γ' = 101.7219760306° = 101°43'11″ = 1.36662479219 rad

# How did we calculate this triangle? ### 1. The triangle circumference is the sum of the lengths of its three sides ### 2. Semiperimeter of the triangle ### 3. The triangle area using Heron's formula ### 4. Calculate the heights of the triangle from its area. ### 5. Calculation of the inner angles of the triangle using a Law of Cosines ### 6. Inradius ### 7. Circumradius ### 8. 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.