# 2 6 6 triangle

### Acute isosceles triangle.

Sides: a = 2   b = 6   c = 6

Area: T = 5.91660797831
Perimeter: p = 14
Semiperimeter: s = 7

Angle ∠ A = α = 19.18881364537° = 19°11'17″ = 0.33548961584 rad
Angle ∠ B = β = 80.40659317731° = 80°24'21″ = 1.40333482476 rad
Angle ∠ C = γ = 80.40659317731° = 80°24'21″ = 1.40333482476 rad

Height: ha = 5.91660797831
Height: hb = 1.97220265944
Height: hc = 1.97220265944

Median: ma = 5.91660797831
Median: mb = 3.31766247904
Median: mc = 3.31766247904

Inradius: r = 0.84551542547
Circumradius: R = 3.0432555317

Vertex coordinates: A[6; 0] B[0; 0] C[0.33333333333; 1.97220265944]
Centroid: CG[2.11111111111; 0.65773421981]
Coordinates of the circumscribed circle: U[3; 0.50770925528]
Coordinates of the inscribed circle: I[1; 0.84551542547]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 160.8121863546° = 160°48'43″ = 0.33548961584 rad
∠ B' = β' = 99.59440682269° = 99°35'39″ = 1.40333482476 rad
∠ C' = γ' = 99.59440682269° = 99°35'39″ = 1.40333482476 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.