# 2 19 19 triangle

### Acute isosceles triangle.

Sides: a = 2   b = 19   c = 19

Area: T = 18.9743665961
Perimeter: p = 40
Semiperimeter: s = 20

Angle ∠ A = α = 6.03439226196° = 6°2'2″ = 0.10553118165 rad
Angle ∠ B = β = 86.98330386902° = 86°58'59″ = 1.51881404185 rad
Angle ∠ C = γ = 86.98330386902° = 86°58'59″ = 1.51881404185 rad

Height: ha = 18.9743665961
Height: hb = 1.99772279959
Height: hc = 1.99772279959

Median: ma = 18.9743665961
Median: mb = 9.60546863561
Median: mc = 9.60546863561

Inradius: r = 0.94986832981
Circumradius: R = 9.51331852943

Vertex coordinates: A[19; 0] B[0; 0] C[0.10552631579; 1.99772279959]
Centroid: CG[6.36884210526; 0.66657426653]
Coordinates of the circumscribed circle: U[9.5; 0.50106939629]
Coordinates of the inscribed circle: I[1; 0.94986832981]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 173.966607738° = 173°57'58″ = 0.10553118165 rad
∠ B' = β' = 93.01769613098° = 93°1'1″ = 1.51881404185 rad
∠ C' = γ' = 93.01769613098° = 93°1'1″ = 1.51881404185 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.