15 18 25 triangle

Obtuse scalene triangle.

Sides: a = 15   b = 18   c = 25

Area: T = 133.6566275573
Perimeter: p = 58
Semiperimeter: s = 29

Angle ∠ A = α = 36.44333636683° = 36°26'36″ = 0.63660566865 rad
Angle ∠ B = β = 45.46659243544° = 45°27'57″ = 0.79435300774 rad
Angle ∠ C = γ = 98.09107119773° = 98°5'27″ = 1.71220058896 rad

Height: ha = 17.8210836743
Height: hb = 14.85106972859
Height: hc = 10.69325020458

Median: ma = 20.45111613362
Median: mb = 18.5477236991
Median: mc = 10.87442815855

Inradius: r = 4.60988370887
Circumradius: R = 12.62656697844

Vertex coordinates: A[25; 0] B[0; 0] C[10.52; 10.69325020458]
Centroid: CG[11.84; 3.56441673486]
Coordinates of the circumscribed circle: U[12.5; -1.77769461178]
Coordinates of the inscribed circle: I[11; 4.60988370887]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 143.5576636332° = 143°33'24″ = 0.63660566865 rad
∠ B' = β' = 134.5344075646° = 134°32'3″ = 0.79435300774 rad
∠ C' = γ' = 81.90992880227° = 81°54'33″ = 1.71220058896 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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