# 16 26 26 triangle

### Acute isosceles triangle.

Sides: a = 16   b = 26   c = 26

Area: T = 197.909907003
Perimeter: p = 68
Semiperimeter: s = 34

Angle ∠ A = α = 35.84404262788° = 35°50'26″ = 0.62655334439 rad
Angle ∠ B = β = 72.08797868606° = 72°4'47″ = 1.25880296049 rad
Angle ∠ C = γ = 72.08797868606° = 72°4'47″ = 1.25880296049 rad

Height: ha = 24.73986337537
Height: hb = 15.22437746177
Height: hc = 15.22437746177

Median: ma = 24.73986337537
Median: mb = 17.23436879396
Median: mc = 17.23436879396

Inradius: r = 5.82108550009
Circumradius: R = 13.66328402104

Vertex coordinates: A[26; 0] B[0; 0] C[4.92330769231; 15.22437746177]
Centroid: CG[10.30876923077; 5.07545915392]
Coordinates of the circumscribed circle: U[13; 4.2043950834]
Coordinates of the inscribed circle: I[8; 5.82108550009]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 144.1659573721° = 144°9'34″ = 0.62655334439 rad
∠ B' = β' = 107.9220213139° = 107°55'13″ = 1.25880296049 rad
∠ C' = γ' = 107.9220213139° = 107°55'13″ = 1.25880296049 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.