11 15 18 triangle

Acute scalene triangle.

Sides: a = 11   b = 15   c = 18

Area: T = 82.3166462509
Perimeter: p = 44
Semiperimeter: s = 22

Angle ∠ A = α = 37.57215423252° = 37°34'18″ = 0.65657471186 rad
Angle ∠ B = β = 56.25110114041° = 56°15'4″ = 0.98217653566 rad
Angle ∠ C = γ = 86.17774462707° = 86°10'39″ = 1.50440801784 rad

Height: ha = 14.96766295471
Height: hb = 10.97655283345
Height: hc = 9.14662736121

Median: ma = 15.62884996081
Median: mb = 12.89437969582
Median: mc = 9.59216630466

Inradius: r = 3.74216573868
Circumradius: R = 9.02200669145

Vertex coordinates: A[18; 0] B[0; 0] C[6.11111111111; 9.14662736121]
Centroid: CG[8.0377037037; 3.04987578707]
Coordinates of the circumscribed circle: U[9; 0.60113377943]
Coordinates of the inscribed circle: I[7; 3.74216573868]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 142.4288457675° = 142°25'42″ = 0.65657471186 rad
∠ B' = β' = 123.7498988596° = 123°44'56″ = 0.98217653566 rad
∠ C' = γ' = 93.82325537293° = 93°49'21″ = 1.50440801784 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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