# Triangle calculator SSS - result

Please enter the triangle sides:

### Acute scalene triangle.

Sides: a = 12.5   b = 3.5   c = 12.98

Area: T = 21.87549994512
Perimeter: p = 28.98
Semiperimeter: s = 14.49

Angle ∠ A = α = 74.37696550624° = 74°22'11″ = 1.29879953444 rad
Angle ∠ B = β = 15.64331791924° = 15°38'35″ = 0.27330249824 rad
Angle ∠ C = γ = 89.98771657453° = 89°59'14″ = 1.57105723268 rad

Height: ha = 3.54999999122
Height: hb = 12.54999996864
Height: hc = 3.37105700233

Median: ma = 7.16325903136
Median: mb = 12.62215173414
Median: mc = 6.49107549638

Inradius: r = 1.51096617979
Circumradius: R = 6.49900001628

Vertex coordinates: A[12.98; 0] B[0; 0] C[12.03769953775; 3.37105700233]
Centroid: CG[8.33989984592; 1.12435233411]
Coordinates of the circumscribed circle: U[6.49; 0.001145376]
Coordinates of the inscribed circle: I[10.99; 1.51096617979]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 105.6330344938° = 105°37'49″ = 1.29879953444 rad
∠ B' = β' = 164.3576820808° = 164°21'25″ = 0.27330249824 rad
∠ C' = γ' = 90.01328342547° = 90°46″ = 1.57105723268 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.