6 13 18 triangle

Obtuse scalene triangle.

Sides: a = 6   b = 13   c = 18

Area: T = 25.21878012523
Perimeter: p = 37
Semiperimeter: s = 18.5

Angle ∠ A = α = 12.44770198968° = 12°26'49″ = 0.21772414793 rad
Angle ∠ B = β = 27.83994971122° = 27°50'22″ = 0.48658908867 rad
Angle ∠ C = γ = 139.7133482991° = 139°42'49″ = 2.43884602876 rad

Height: ha = 8.40659337508
Height: hb = 3.88796617311
Height: hc = 2.80219779169

Median: ma = 15.41110350074
Median: mb = 11.73766945943
Median: mc = 4.63768092477

Inradius: r = 1.3633124392
Circumradius: R = 13.91987392465

Vertex coordinates: A[18; 0] B[0; 0] C[5.30655555556; 2.80219779169]
Centroid: CG[7.76985185185; 0.9343992639]
Coordinates of the circumscribed circle: U[9; -10.61774998098]
Coordinates of the inscribed circle: I[5.5; 1.3633124392]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 167.5532980103° = 167°33'11″ = 0.21772414793 rad
∠ B' = β' = 152.1610502888° = 152°9'38″ = 0.48658908867 rad
∠ C' = γ' = 40.2876517009° = 40°17'11″ = 2.43884602876 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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