21 28 30 triangle

Acute scalene triangle.

Sides: a = 21   b = 28   c = 30

Area: T = 282.5549884976
Perimeter: p = 79
Semiperimeter: s = 39.5

Angle ∠ A = α = 42.2798724472° = 42°16'43″ = 0.73879029456 rad
Angle ∠ B = β = 63.76443856588° = 63°45'52″ = 1.11328984753 rad
Angle ∠ C = γ = 73.95768898692° = 73°57'25″ = 1.29107912328 rad

Height: ha = 26.91095128549
Height: hb = 20.18221346411
Height: hc = 18.83766589984

Median: ma = 27.05108779894
Median: mb = 21.78330209108
Median: mc = 19.6855019685

Inradius: r = 7.1533161645
Circumradius: R = 15.60878633703

Vertex coordinates: A[30; 0] B[0; 0] C[9.28333333333; 18.83766589984]
Centroid: CG[13.09444444444; 6.27988863328]
Coordinates of the circumscribed circle: U[15; 4.31333976151]
Coordinates of the inscribed circle: I[11.5; 7.1533161645]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 137.7211275528° = 137°43'17″ = 0.73879029456 rad
∠ B' = β' = 116.2365614341° = 116°14'8″ = 1.11328984753 rad
∠ C' = γ' = 106.0433110131° = 106°2'35″ = 1.29107912328 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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