# 14 20 26 triangle

### Obtuse scalene triangle.

Sides: a = 14   b = 20   c = 26

Area: T = 138.5644064605
Perimeter: p = 60
Semiperimeter: s = 30

Angle ∠ A = α = 32.2044227504° = 32°12'15″ = 0.5622069803 rad
Angle ∠ B = β = 49.58325617943° = 49°34'57″ = 0.86553789549 rad
Angle ∠ C = γ = 98.21332107017° = 98°12'48″ = 1.71441438957 rad

Height: ha = 19.79548663722
Height: hb = 13.85664064606
Height: hc = 10.65987742004

Median: ma = 22.11333443875
Median: mb = 18.33303027798
Median: mc = 11.35878166916

Inradius: r = 4.61988021535
Circumradius: R = 13.13547186241

Vertex coordinates: A[26; 0] B[0; 0] C[9.07769230769; 10.65987742004]
Centroid: CG[11.69223076923; 3.55329247335]
Coordinates of the circumscribed circle: U[13; -1.87663883749]
Coordinates of the inscribed circle: I[10; 4.61988021535]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 147.7965772496° = 147°47'45″ = 0.5622069803 rad
∠ B' = β' = 130.4177438206° = 130°25'3″ = 0.86553789549 rad
∠ C' = γ' = 81.78767892983° = 81°47'12″ = 1.71441438957 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.