# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 13   b = 17   c = 28

Area: T = 74.61990324247
Perimeter: p = 58
Semiperimeter: s = 29

Angle ∠ A = α = 18.27218132324° = 18°16'19″ = 0.31989033012 rad
Angle ∠ B = β = 24.20545008373° = 24°12'16″ = 0.42224482334 rad
Angle ∠ C = γ = 137.524368593° = 137°31'25″ = 2.4400241119 rad

Height: ha = 11.48798511423
Height: hb = 8.7798709697
Height: hc = 5.33299308875

Median: ma = 22.23217340754
Median: mb = 20.10659692629
Median: mc = 5.74545626465

Inradius: r = 2.57330700836
Circumradius: R = 20.73219761424

Vertex coordinates: A[28; 0] B[0; 0] C[11.85771428571; 5.33299308875]
Centroid: CG[13.28657142857; 1.77766436292]
Coordinates of the circumscribed circle: U[14; -15.29110050281]
Coordinates of the inscribed circle: I[12; 2.57330700836]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 161.7288186768° = 161°43'41″ = 0.31989033012 rad
∠ B' = β' = 155.7955499163° = 155°47'44″ = 0.42224482334 rad
∠ C' = γ' = 42.47663140697° = 42°28'35″ = 2.4400241119 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.