15 20 28 triangle

Obtuse scalene triangle.

Sides: a = 15   b = 20   c = 28

Area: T = 144.6377261797
Perimeter: p = 63
Semiperimeter: s = 31.5

Angle ∠ A = α = 31.10218950348° = 31°6'7″ = 0.5432830472 rad
Angle ∠ B = β = 43.53111521674° = 43°31'52″ = 0.76597619325 rad
Angle ∠ C = γ = 105.3676952798° = 105°22'1″ = 1.83990002491 rad

Height: ha = 19.28549682395
Height: hb = 14.46437261797
Height: hc = 10.33112329855

Median: ma = 23.14662739982
Median: mb = 20.11221853611
Median: mc = 10.79435165725

Inradius: r = 4.59216591047
Circumradius: R = 14.51990801728

Vertex coordinates: A[28; 0] B[0; 0] C[10.875; 10.33112329855]
Centroid: CG[12.95883333333; 3.44437443285]
Coordinates of the circumscribed circle: U[14; -3.84875562458]
Coordinates of the inscribed circle: I[11.5; 4.59216591047]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 148.8988104965° = 148°53'53″ = 0.5432830472 rad
∠ B' = β' = 136.4698847833° = 136°28'8″ = 0.76597619325 rad
∠ C' = γ' = 74.63330472022° = 74°37'59″ = 1.83990002491 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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