2 20 21 triangle

Obtuse scalene triangle.

Sides: a = 2   b = 20   c = 21

Area: T = 17.73223856263
Perimeter: p = 43
Semiperimeter: s = 21.5

Angle ∠ A = α = 4.84438195264° = 4°50'38″ = 0.08545405991 rad
Angle ∠ B = β = 57.60876345142° = 57°36'27″ = 1.00554428966 rad
Angle ∠ C = γ = 117.5498545959° = 117°32'55″ = 2.05216091579 rad

Height: ha = 17.73223856263
Height: hb = 1.77332385626
Height: hc = 1.68987986311

Median: ma = 20.48216991483
Median: mb = 11.06879718106
Median: mc = 9.57986220303

Inradius: r = 0.82547621222
Circumradius: R = 11.84327381643

Vertex coordinates: A[21; 0] B[0; 0] C[1.07114285714; 1.68987986311]
Centroid: CG[7.35771428571; 0.5632932877]
Coordinates of the circumscribed circle: U[10.5; -5.4777266401]
Coordinates of the inscribed circle: I[1.5; 0.82547621222]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 175.1566180474° = 175°9'22″ = 0.08545405991 rad
∠ B' = β' = 122.3922365486° = 122°23'33″ = 1.00554428966 rad
∠ C' = γ' = 62.45114540405° = 62°27'5″ = 2.05216091579 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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