# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 5   b = 18   c = 20

Area: T = 43.15659671424
Perimeter: p = 43
Semiperimeter: s = 21.5

Angle ∠ A = α = 13.8722102735° = 13°52'20″ = 0.24221138669 rad
Angle ∠ B = β = 59.66986476367° = 59°40'7″ = 1.04114143615 rad
Angle ∠ C = γ = 106.4599249628° = 106°27'33″ = 1.85880644252 rad

Height: ha = 17.2622386857
Height: hb = 4.79551074603
Height: hc = 4.31655967142

Median: ma = 18.86113361139
Median: mb = 11.46773449412
Median: mc = 8.63113382508

Inradius: r = 2.00772542857
Circumradius: R = 10.42772949906

Vertex coordinates: A[20; 0] B[0; 0] C[2.525; 4.31655967142]
Centroid: CG[7.50883333333; 1.43985322381]
Coordinates of the circumscribed circle: U[10; -2.95444002473]
Coordinates of the inscribed circle: I[3.5; 2.00772542857]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 166.1287897265° = 166°7'40″ = 0.24221138669 rad
∠ B' = β' = 120.3311352363° = 120°19'53″ = 1.04114143615 rad
∠ C' = γ' = 73.54107503717° = 73°32'27″ = 1.85880644252 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.