# 18 19 29 triangle

### Obtuse scalene triangle.

Sides: a = 18   b = 19   c = 29

Area: T = 166.4933243106
Perimeter: p = 66
Semiperimeter: s = 33

Angle ∠ A = α = 37.1810730227° = 37°10'51″ = 0.64989261608 rad
Angle ∠ B = β = 39.63657882867° = 39°38'9″ = 0.69217750072 rad
Angle ∠ C = γ = 103.1833481486° = 103°11'1″ = 1.80108914856 rad

Height: ha = 18.4999249234
Height: hb = 17.52656045375
Height: hc = 11.4822292628

Median: ma = 22.8043508502
Median: mb = 22.18767077323
Median: mc = 11.5

Inradius: r = 5.04552497911
Circumradius: R = 14.89224962584

Vertex coordinates: A[29; 0] B[0; 0] C[13.86220689655; 11.4822292628]
Centroid: CG[14.28773563218; 3.8277430876]
Coordinates of the circumscribed circle: U[14.5; -3.39765342344]
Coordinates of the inscribed circle: I[14; 5.04552497911]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 142.8199269773° = 142°49'9″ = 0.64989261608 rad
∠ B' = β' = 140.3644211713° = 140°21'51″ = 0.69217750072 rad
∠ C' = γ' = 76.81765185138° = 76°48'59″ = 1.80108914856 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.