# Triangle calculator SSS - result

Please enter the triangle sides:

### Acute scalene triangle.

Sides: a = 15   b = 21   c = 25

Area: T = 157.166611435
Perimeter: p = 61
Semiperimeter: s = 30.5

Angle ∠ A = α = 36.77988554827° = 36°46'44″ = 0.64219121233 rad
Angle ∠ B = β = 56.95325545924° = 56°57'9″ = 0.99440095951 rad
Angle ∠ C = γ = 86.26985899249° = 86°16'7″ = 1.50656709352 rad

Height: ha = 20.95554819134
Height: hb = 14.96882013667
Height: hc = 12.5733289148

Median: ma = 21.83546055609
Median: mb = 17.74111949992
Median: mc = 13.29547358003

Inradius: r = 5.15329873558
Circumradius: R = 12.52765551556

Vertex coordinates: A[25; 0] B[0; 0] C[8.18; 12.5733289148]
Centroid: CG[11.06; 4.19110963827]
Coordinates of the circumscribed circle: U[12.5; 0.81552202562]
Coordinates of the inscribed circle: I[9.5; 5.15329873558]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 143.2211144517° = 143°13'16″ = 0.64219121233 rad
∠ B' = β' = 123.0477445408° = 123°2'51″ = 0.99440095951 rad
∠ C' = γ' = 93.73114100751° = 93°43'53″ = 1.50656709352 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.