9 15 20 triangle

Obtuse scalene triangle.

Sides: a = 9   b = 15   c = 20

Area: T = 63.27771680782
Perimeter: p = 44
Semiperimeter: s = 22

Angle ∠ A = α = 24.95113010927° = 24°57'5″ = 0.43554823567 rad
Angle ∠ B = β = 44.67546095644° = 44°40'29″ = 0.78797190289 rad
Angle ∠ C = γ = 110.3744089343° = 110°22'27″ = 1.92663912679 rad

Height: ha = 14.06215929063
Height: hb = 8.43769557438
Height: hc = 6.32877168078

Median: ma = 17.09553209973
Median: mb = 13.57438719605
Median: mc = 7.28801098893

Inradius: r = 2.87662349126
Circumradius: R = 10.66773547584

Vertex coordinates: A[20; 0] B[0; 0] C[6.4; 6.32877168078]
Centroid: CG[8.8; 2.10992389359]
Coordinates of the circumscribed circle: U[10; -3.71438198048]
Coordinates of the inscribed circle: I[7; 2.87662349126]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 155.0498698907° = 155°2'55″ = 0.43554823567 rad
∠ B' = β' = 135.3255390436° = 135°19'31″ = 0.78797190289 rad
∠ C' = γ' = 69.62659106571° = 69°37'33″ = 1.92663912679 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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