# 2 19 20 triangle

### Obtuse scalene triangle.

Sides: a = 2   b = 19   c = 20

Area: T = 16.86552749755
Perimeter: p = 41
Semiperimeter: s = 20.5

Angle ∠ A = α = 5.09325397195° = 5°5'33″ = 0.08988815854 rad
Angle ∠ B = β = 57.48663853668° = 57°29'11″ = 1.00333266997 rad
Angle ∠ C = γ = 117.4211074914° = 117°25'16″ = 2.04993843685 rad

Height: ha = 16.86552749755
Height: hb = 1.77552921027
Height: hc = 1.68765274976

Median: ma = 19.48107597388
Median: mb = 10.57111872559
Median: mc = 9.08329510623

Inradius: r = 0.82326963403
Circumradius: R = 11.26657516866

Vertex coordinates: A[20; 0] B[0; 0] C[1.075; 1.68765274976]
Centroid: CG[7.025; 0.56221758325]
Coordinates of the circumscribed circle: U[10; -5.18881751188]
Coordinates of the inscribed circle: I[1.5; 0.82326963403]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 174.907746028° = 174°54'27″ = 0.08988815854 rad
∠ B' = β' = 122.5143614633° = 122°30'49″ = 1.00333266997 rad
∠ C' = γ' = 62.57989250863° = 62°34'44″ = 2.04993843685 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.