13 21 25 triangle

Obtuse scalene triangle.

Sides: a = 13   b = 21   c = 25

Area: T = 136.4488479288
Perimeter: p = 59
Semiperimeter: s = 29.5

Angle ∠ A = α = 31.31990870573° = 31°19'9″ = 0.54766211879 rad
Angle ∠ B = β = 57.10766549978° = 57°6'24″ = 0.99766991545 rad
Angle ∠ C = γ = 91.57442579449° = 91°34'27″ = 1.59882723112 rad

Height: ha = 20.99220737366
Height: hb = 12.99550932655
Height: hc = 10.9165878343

Median: ma = 22.15328779169
Median: mb = 16.93436942219
Median: mc = 12.19663109177

Inradius: r = 4.62553721793
Circumradius: R = 12.50547197954

Vertex coordinates: A[25; 0] B[0; 0] C[7.06; 10.9165878343]
Centroid: CG[10.68766666667; 3.63986261143]
Coordinates of the circumscribed circle: U[12.5; -0.34435362581]
Coordinates of the inscribed circle: I[8.5; 4.62553721793]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 148.6810912943° = 148°40'51″ = 0.54766211879 rad
∠ B' = β' = 122.8933345002° = 122°53'36″ = 0.99766991545 rad
∠ C' = γ' = 88.42657420551° = 88°25'33″ = 1.59882723112 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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