# 22 26 26 triangle

### Acute isosceles triangle.

Sides: a = 22   b = 26   c = 26

Area: T = 259.1432817767
Perimeter: p = 74
Semiperimeter: s = 37

Angle ∠ A = α = 50.05879989752° = 50°3'29″ = 0.87436768991 rad
Angle ∠ B = β = 64.97110005124° = 64°58'16″ = 1.13439578773 rad
Angle ∠ C = γ = 64.97110005124° = 64°58'16″ = 1.13439578773 rad

Height: ha = 23.55884379788
Height: hb = 19.93440629051
Height: hc = 19.93440629051

Median: ma = 23.55884379788
Median: mb = 20.27331349327
Median: mc = 20.27331349327

Inradius: r = 7.00438599396
Circumradius: R = 14.34773009673

Vertex coordinates: A[26; 0] B[0; 0] C[9.30876923077; 19.93440629051]
Centroid: CG[11.76992307692; 6.6454687635]
Coordinates of the circumscribed circle: U[13; 6.07700119477]
Coordinates of the inscribed circle: I[11; 7.00438599396]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 129.9422001025° = 129°56'31″ = 0.87436768991 rad
∠ B' = β' = 115.0298999488° = 115°1'44″ = 1.13439578773 rad
∠ C' = γ' = 115.0298999488° = 115°1'44″ = 1.13439578773 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.