# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 4   b = 15   c = 18

Area: T = 21.66765064097
Perimeter: p = 37
Semiperimeter: s = 18.5

Angle ∠ A = α = 9.23554919597° = 9°14'8″ = 0.16111897427 rad
Angle ∠ B = β = 37.00223228374° = 37°8″ = 0.64658123644 rad
Angle ∠ C = γ = 133.7622185203° = 133°45'44″ = 2.33545905465 rad

Height: ha = 10.83332532048
Height: hb = 2.88988675213
Height: hc = 2.40773896011

Median: ma = 16.44768842034
Median: mb = 10.66553645039
Median: mc = 6.2854902545

Inradius: r = 1.17111625086
Circumradius: R = 12.46216306337

Vertex coordinates: A[18; 0] B[0; 0] C[3.19444444444; 2.40773896011]
Centroid: CG[7.06548148148; 0.80224632004]
Coordinates of the circumscribed circle: U[9; -8.61992945216]
Coordinates of the inscribed circle: I[3.5; 1.17111625086]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 170.765450804° = 170°45'52″ = 0.16111897427 rad
∠ B' = β' = 142.9987677163° = 142°59'52″ = 0.64658123644 rad
∠ C' = γ' = 46.23878147971° = 46°14'16″ = 2.33545905465 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.