# 1 19 19 triangle

### Acute isosceles triangle.

Sides: a = 1   b = 19   c = 19

Area: T = 9.49767099566
Perimeter: p = 39
Semiperimeter: s = 19.5

Angle ∠ A = α = 3.01659155085° = 3°57″ = 0.05326376556 rad
Angle ∠ B = β = 88.49220422458° = 88°29'31″ = 1.5444477499 rad
Angle ∠ C = γ = 88.49220422458° = 88°29'31″ = 1.5444477499 rad

Height: ha = 18.99334199132
Height: hb = 10.9996536796
Height: hc = 10.9996536796

Median: ma = 18.99334199132
Median: mb = 9.52662794416
Median: mc = 9.52662794416

Inradius: r = 0.4877010767
Circumradius: R = 9.50332911832

Vertex coordinates: A[19; 0] B[0; 0] C[0.02663157895; 10.9996536796]
Centroid: CG[6.34221052632; 0.33332178932]
Coordinates of the circumscribed circle: U[9.5; 0.25500866101]
Coordinates of the inscribed circle: I[0.5; 0.4877010767]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 176.9844084492° = 176°59'3″ = 0.05326376556 rad
∠ B' = β' = 91.50879577542° = 91°30'29″ = 1.5444477499 rad
∠ C' = γ' = 91.50879577542° = 91°30'29″ = 1.5444477499 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.