# 14 14 26 triangle

### Obtuse isosceles triangle.

Sides: a = 14   b = 14   c = 26

Area: T = 67.55499814952
Perimeter: p = 54
Semiperimeter: s = 27

Angle ∠ A = α = 21.78767892983° = 21°47'12″ = 0.38802512067 rad
Angle ∠ B = β = 21.78767892983° = 21°47'12″ = 0.38802512067 rad
Angle ∠ C = γ = 136.4266421403° = 136°25'35″ = 2.38110902402 rad

Height: ha = 9.65499973565
Height: hb = 9.65499973565
Height: hc = 5.19661524227

Median: ma = 19.67223155729
Median: mb = 19.67223155729
Median: mc = 5.19661524227

Inradius: r = 2.50218511665
Circumradius: R = 18.86601087935

Vertex coordinates: A[26; 0] B[0; 0] C[13; 5.19661524227]
Centroid: CG[13; 1.73220508076]
Coordinates of the circumscribed circle: U[13; -13.66439563708]
Coordinates of the inscribed circle: I[13; 2.50218511665]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 158.2133210702° = 158°12'48″ = 0.38802512067 rad
∠ B' = β' = 158.2133210702° = 158°12'48″ = 0.38802512067 rad
∠ C' = γ' = 43.57435785965° = 43°34'25″ = 2.38110902402 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.