4 19 20 triangle

Obtuse scalene triangle.

Sides: a = 4   b = 19   c = 20

Area: T = 37.56224480033
Perimeter: p = 43
Semiperimeter: s = 21.5

Angle ∠ A = α = 11.40223236093° = 11°24'8″ = 0.19990080894 rad
Angle ∠ B = β = 69.89444902121° = 69°53'40″ = 1.22198889832 rad
Angle ∠ C = γ = 98.70331861786° = 98°42'11″ = 1.7232695581 rad

Height: ha = 18.78112240016
Height: hb = 3.95439418951
Height: hc = 3.75662448003

Median: ma = 19.40436079119
Median: mb = 10.85112672071
Median: mc = 9.40774438611

Inradius: r = 1.74770906048
Circumradius: R = 10.11664865497

Vertex coordinates: A[20; 0] B[0; 0] C[1.375; 3.75662448003]
Centroid: CG[7.125; 1.25220816001]
Coordinates of the circumscribed circle: U[10; -1.5310784149]
Coordinates of the inscribed circle: I[2.5; 1.74770906048]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 168.5987676391° = 168°35'52″ = 0.19990080894 rad
∠ B' = β' = 110.1065509788° = 110°6'20″ = 1.22198889832 rad
∠ C' = γ' = 81.29768138214° = 81°17'49″ = 1.7232695581 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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