15 21 28 triangle

Obtuse scalene triangle.

Sides: a = 15   b = 21   c = 28

Area: T = 154.7132636847
Perimeter: p = 64
Semiperimeter: s = 32

Angle ∠ A = α = 31.75113162564° = 31°45'5″ = 0.55441650105 rad
Angle ∠ B = β = 47.4533334116° = 47°27'12″ = 0.82882169214 rad
Angle ∠ C = γ = 100.7955349628° = 100°47'43″ = 1.75992107217 rad

Height: ha = 20.62883515795
Height: hb = 14.73545368425
Height: hc = 11.05109026319

Median: ma = 23.58549528301
Median: mb = 19.85657296517
Median: mc = 11.70546999107

Inradius: r = 4.83547699015
Circumradius: R = 14.25222294555

Vertex coordinates: A[28; 0] B[0; 0] C[10.14328571429; 11.05109026319]
Centroid: CG[12.71442857143; 3.68436342106]
Coordinates of the circumscribed circle: U[14; -2.66994651996]
Coordinates of the inscribed circle: I[11; 4.83547699015]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 148.2498683744° = 148°14'55″ = 0.55441650105 rad
∠ B' = β' = 132.5476665884° = 132°32'48″ = 0.82882169214 rad
∠ C' = γ' = 79.20546503724° = 79°12'17″ = 1.75992107217 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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