5 18 21 triangle

Obtuse scalene triangle.

Sides: a = 5   b = 18   c = 21

Area: T = 38.67881592116
Perimeter: p = 44
Semiperimeter: s = 22

Angle ∠ A = α = 11.80987972119° = 11°48'32″ = 0.2066102392 rad
Angle ∠ B = β = 47.4533334116° = 47°27'12″ = 0.82882169214 rad
Angle ∠ C = γ = 120.7387868672° = 120°44'16″ = 2.10772733402 rad

Height: ha = 15.47112636847
Height: hb = 4.29875732457
Height: hc = 3.68436342106

Median: ma = 19.39771647413
Median: mb = 12.32988280059
Median: mc = 8.01656097709

Inradius: r = 1.7588098146
Circumradius: R = 12.21661966761

Vertex coordinates: A[21; 0] B[0; 0] C[3.3810952381; 3.68436342106]
Centroid: CG[8.1276984127; 1.22878780702]
Coordinates of the circumscribed circle: U[10.5; -6.24438338567]
Coordinates of the inscribed circle: I[4; 1.7588098146]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 168.1911202788° = 168°11'28″ = 0.2066102392 rad
∠ B' = β' = 132.5476665884° = 132°32'48″ = 0.82882169214 rad
∠ C' = γ' = 59.26221313279° = 59°15'44″ = 2.10772733402 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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