18 28 30 triangle

Acute scalene triangle.

Sides: a = 18   b = 28   c = 30

Area: T = 246.5776560119
Perimeter: p = 76
Semiperimeter: s = 38

Angle ∠ A = α = 35.95105676196° = 35°57'2″ = 0.62774557729 rad
Angle ∠ B = β = 65.95879240942° = 65°57'29″ = 1.15111829432 rad
Angle ∠ C = γ = 78.09215082861° = 78°5'29″ = 1.36329539374 rad

Height: ha = 27.39773955688
Height: hb = 17.61326114371
Height: hc = 16.43884373413

Median: ma = 27.58662284483
Median: mb = 20.39660780544
Median: mc = 18.13883571472

Inradius: r = 6.48988568452
Circumradius: R = 15.33299242969

Vertex coordinates: A[30; 0] B[0; 0] C[7.33333333333; 16.43884373413]
Centroid: CG[12.44444444444; 5.47994791138]
Coordinates of the circumscribed circle: U[15; 3.1633317712]
Coordinates of the inscribed circle: I[10; 6.48988568452]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 144.049943238° = 144°2'58″ = 0.62774557729 rad
∠ B' = β' = 114.0422075906° = 114°2'31″ = 1.15111829432 rad
∠ C' = γ' = 101.9088491714° = 101°54'31″ = 1.36329539374 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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