# 2 11 11 triangle

### Acute isosceles triangle.

Sides: a = 2   b = 11   c = 11

Area: T = 10.95444511501
Perimeter: p = 24
Semiperimeter: s = 12

Angle ∠ A = α = 10.43218171409° = 10°25'55″ = 0.18220695561 rad
Angle ∠ B = β = 84.78440914295° = 84°47'3″ = 1.48797615488 rad
Angle ∠ C = γ = 84.78440914295° = 84°47'3″ = 1.48797615488 rad

Height: ha = 10.95444511501
Height: hb = 1.99217183909
Height: hc = 1.99217183909

Median: ma = 10.95444511501
Median: mb = 5.67989083458
Median: mc = 5.67989083458

Inradius: r = 0.91328709292
Circumradius: R = 5.52328691215

Vertex coordinates: A[11; 0] B[0; 0] C[0.18218181818; 1.99217183909]
Centroid: CG[3.72772727273; 0.66439061303]
Coordinates of the circumscribed circle: U[5.5; 0.5022079011]
Coordinates of the inscribed circle: I[1; 0.91328709292]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 169.5688182859° = 169°34'5″ = 0.18220695561 rad
∠ B' = β' = 95.21659085705° = 95°12'57″ = 1.48797615488 rad
∠ C' = γ' = 95.21659085705° = 95°12'57″ = 1.48797615488 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.