# Triangle calculator SSS - result

Please enter the triangle sides:

### Acute scalene triangle.

Sides: a = 10   b = 15   c = 18

Area: T = 754.9995833322
Perimeter: p = 43
Semiperimeter: s = 21.5

Angle ∠ A = α = 33.74987759158° = 33°44'56″ = 0.58990272582 rad
Angle ∠ B = β = 56.44222103696° = 56°26'32″ = 0.98551024081 rad
Angle ∠ C = γ = 89.80990137146° = 89°48'32″ = 1.56774629873 rad

Height: ha = 154.9999166664
Height: hb = 10.9999444443
Height: hc = 8.33332870369

Median: ma = 15.79655689989
Median: mb = 12.48799839743
Median: mc = 9.02877350426

Inradius: r = 3.48883527131
Circumradius: R = 99.0000500004

Vertex coordinates: A[18; 0] B[0; 0] C[5.52877777778; 8.33332870369]
Centroid: CG[7.84325925926; 2.77877623456]
Coordinates of the circumscribed circle: U[9; 0.03300001667]
Coordinates of the inscribed circle: I[6.5; 3.48883527131]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 146.2511224084° = 146°15'4″ = 0.58990272582 rad
∠ B' = β' = 123.558778963° = 123°33'28″ = 0.98551024081 rad
∠ C' = γ' = 90.19109862854° = 90°11'28″ = 1.56774629873 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.