5 19 21 triangle

Obtuse scalene triangle.

Sides: a = 5   b = 19   c = 21

Area: T = 45.46663336987
Perimeter: p = 45
Semiperimeter: s = 22.5

Angle ∠ A = α = 13.17435511073° = 13°10'25″ = 0.2329921841 rad
Angle ∠ B = β = 60° = 1.04771975512 rad
Angle ∠ C = γ = 106.8266448893° = 106°49'35″ = 1.86444732614 rad

Height: ha = 18.18765334795
Height: hb = 4.7865929863
Height: hc = 4.33301270189

Median: ma = 19.86883164863
Median: mb = 11.94878031453
Median: mc = 9.09767026993

Inradius: r = 2.02107259422
Circumradius: R = 10.97696551146

Vertex coordinates: A[21; 0] B[0; 0] C[2.5; 4.33301270189]
Centroid: CG[7.83333333333; 1.4433375673]
Coordinates of the circumscribed circle: U[10.5; -3.17554264805]
Coordinates of the inscribed circle: I[3.5; 2.02107259422]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 166.8266448893° = 166°49'35″ = 0.2329921841 rad
∠ B' = β' = 120° = 1.04771975512 rad
∠ C' = γ' = 73.17435511073° = 73°10'25″ = 1.86444732614 rad

Calculate another triangle




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.


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