# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 13   b = 15   c = 26

Area: T = 67.35498329619
Perimeter: p = 54
Semiperimeter: s = 27

Angle ∠ A = α = 20.20552235834° = 20°12'19″ = 0.35326476776 rad
Angle ∠ B = β = 23.48656716959° = 23°29'8″ = 0.41099022981 rad
Angle ∠ C = γ = 136.3099104721° = 136°18'33″ = 2.37990426778 rad

Height: ha = 10.36215127634
Height: hb = 8.98799777283
Height: hc = 5.18107563817

Median: ma = 20.20551973512
Median: mb = 19.1387659209
Median: mc = 5.29215026221

Inradius: r = 2.49444382578
Circumradius: R = 18.82196457847

Vertex coordinates: A[26; 0] B[0; 0] C[11.92330769231; 5.18107563817]
Centroid: CG[12.6411025641; 1.72769187939]
Coordinates of the circumscribed circle: U[13; -13.60880515674]
Coordinates of the inscribed circle: I[12; 2.49444382578]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 159.7954776417° = 159°47'41″ = 0.35326476776 rad
∠ B' = β' = 156.5144328304° = 156°30'52″ = 0.41099022981 rad
∠ C' = γ' = 43.69108952793° = 43°41'27″ = 2.37990426778 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.