# Triangle calculator

Please enter what you know about the triangle:
You have entered side a, b and c.

### Obtuse scalene triangle.

Sides: a = 18.8   b = 11.6   c = 13.8

Area: T = 79.72435818312
Perimeter: p = 44.2
Semiperimeter: s = 22.1

Angle ∠ A = α = 95.09663350634° = 95°5'47″ = 1.66597441534 rad
Angle ∠ B = β = 37.92215566245° = 37°55'18″ = 0.66218560206 rad
Angle ∠ C = γ = 46.98221083121° = 46°58'56″ = 0.82199924796 rad

Height: ha = 8.48112321097
Height: hb = 13.74554451433
Height: hc = 11.55441422944

Median: ma = 8.61104587567
Median: mb = 15.43769686143
Median: mc = 14.01439216496

Inradius: r = 3.60774018928
Circumradius: R = 9.43773080426

Vertex coordinates: A[13.8; 0] B[0; 0] C[14.83304347826; 11.55441422944]
Centroid: CG[9.54334782609; 3.85113807648]
Coordinates of the circumscribed circle: U[6.9; 6.43883835775]
Coordinates of the inscribed circle: I[10.5; 3.60774018928]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 84.90436649366° = 84°54'13″ = 1.66597441534 rad
∠ B' = β' = 142.0788443375° = 142°4'42″ = 0.66218560206 rad
∠ C' = γ' = 133.0187891688° = 133°1'4″ = 0.82199924796 rad

# How did we calculate this triangle?

### 1. Input data entered: side a, b and c. ### 2. The triangle circumference is the sum of the lengths of its three sides ### 3. Semiperimeter of the triangle ### 4. The triangle area using Heron's formula ### 5. Calculate the heights of the triangle from its area. ### 6. Calculation of the inner angles of the triangle using a Law of Cosines ### 7. Inradius ### 8. Circumradius ### 9. 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.