# Triangle calculator SSS - result

Please enter the triangle sides:

### Acute scalene triangle.

Sides: a = 21   b = 26   c = 28

Area: T = 259.9976995175
Perimeter: p = 75
Semiperimeter: s = 37.5

Angle ∠ A = α = 45.5844015584° = 45°35'2″ = 0.79655911582 rad
Angle ∠ B = β = 62.1710842728° = 62°10'15″ = 1.08550859043 rad
Angle ∠ C = γ = 72.24551416879° = 72°14'43″ = 1.2610915591 rad

Height: ha = 24.76216185881
Height: hb = 209.9997688596
Height: hc = 18.57112139411

Median: ma = 24.8954778569
Median: mb = 21.05994396887
Median: mc = 19.03994327647

Inradius: r = 6.93332532047
Circumradius: R = 14.77001698901

Vertex coordinates: A[28; 0] B[0; 0] C[9.80435714286; 18.57112139411]
Centroid: CG[12.60111904762; 6.1990404647]
Coordinates of the circumscribed circle: U[14; 4.48327441149]
Coordinates of the inscribed circle: I[11.5; 6.93332532047]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 134.4165984416° = 134°24'58″ = 0.79655911582 rad
∠ B' = β' = 117.8299157272° = 117°49'45″ = 1.08550859043 rad
∠ C' = γ' = 107.7554858312° = 107°45'17″ = 1.2610915591 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.