# 6 6 11 triangle

### Obtuse isosceles triangle.

Sides: a = 6   b = 6   c = 11

Area: T = 13.18985366891
Perimeter: p = 23
Semiperimeter: s = 11.5

Angle ∠ A = α = 23.55664643091° = 23°33'23″ = 0.41111378623 rad
Angle ∠ B = β = 23.55664643091° = 23°33'23″ = 0.41111378623 rad
Angle ∠ C = γ = 132.8877071382° = 132°53'13″ = 2.31993169289 rad

Height: ha = 4.39661788964
Height: hb = 4.39661788964
Height: hc = 2.39879157617

Median: ma = 8.33766660003
Median: mb = 8.33766660003
Median: mc = 2.39879157617

Inradius: r = 1.14768292773
Circumradius: R = 7.50765189061

Vertex coordinates: A[11; 0] B[0; 0] C[5.5; 2.39879157617]
Centroid: CG[5.5; 0.79993052539]
Coordinates of the circumscribed circle: U[5.5; -5.10986031444]
Coordinates of the inscribed circle: I[5.5; 1.14768292773]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 156.4443535691° = 156°26'37″ = 0.41111378623 rad
∠ B' = β' = 156.4443535691° = 156°26'37″ = 0.41111378623 rad
∠ C' = γ' = 47.11329286182° = 47°6'47″ = 2.31993169289 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.