# 26 26 29 triangle

### Acute isosceles triangle.

Sides: a = 26   b = 26   c = 29

Area: T = 312.9288006896
Perimeter: p = 81
Semiperimeter: s = 40.5

Angle ∠ A = α = 56.1043644797° = 56°6'13″ = 0.97991933241 rad
Angle ∠ B = β = 56.1043644797° = 56°6'13″ = 0.97991933241 rad
Angle ∠ C = γ = 67.79327104061° = 67°47'34″ = 1.18332060054 rad

Height: ha = 24.07113851459
Height: hb = 24.07113851459
Height: hc = 21.58112418549

Median: ma = 24.28796210844
Median: mb = 24.28796210844
Median: mc = 21.58112418549

Inradius: r = 7.72766174542
Circumradius: R = 15.66217493225

Vertex coordinates: A[29; 0] B[0; 0] C[14.5; 21.58112418549]
Centroid: CG[14.5; 7.1943747285]
Coordinates of the circumscribed circle: U[14.5; 5.91994925324]
Coordinates of the inscribed circle: I[14.5; 7.72766174542]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 123.8966355203° = 123°53'47″ = 0.97991933241 rad
∠ B' = β' = 123.8966355203° = 123°53'47″ = 0.97991933241 rad
∠ C' = γ' = 112.2077289594° = 112°12'26″ = 1.18332060054 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.