# 13 14 26 triangle

### Obtuse scalene triangle.

Sides: a = 13   b = 14   c = 26

Area: T = 47.28657007984
Perimeter: p = 53
Semiperimeter: s = 26.5

Angle ∠ A = α = 15.05988800618° = 15°3'32″ = 0.26328270387 rad
Angle ∠ B = β = 16.24880921657° = 16°14'53″ = 0.28435827055 rad
Angle ∠ C = γ = 148.6933027773° = 148°41'35″ = 2.59551829094 rad

Height: ha = 7.27547231998
Height: hb = 6.75551001141
Height: hc = 3.63773615999

Median: ma = 19.8433134833
Median: mb = 19.32661480901
Median: mc = 3.67442346142

Inradius: r = 1.78443660679
Circumradius: R = 25.01881340241

Vertex coordinates: A[26; 0] B[0; 0] C[12.48107692308; 3.63773615999]
Centroid: CG[12.82769230769; 1.21224538666]
Coordinates of the circumscribed circle: U[13; -21.37553837404]
Coordinates of the inscribed circle: I[12.5; 1.78443660679]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 164.9411119938° = 164°56'28″ = 0.26328270387 rad
∠ B' = β' = 163.7521907834° = 163°45'7″ = 0.28435827055 rad
∠ C' = γ' = 31.30769722275° = 31°18'25″ = 2.59551829094 rad

# How did we calculate this triangle?

Now we know the lengths of all three sides of the triangle and the triangle is uniquely determined. Next we calculate another its characteristics - same procedure as calculation of the triangle from the known three sides SSS. ### 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.