10 10 18 triangle

Obtuse isosceles triangle.

Sides: a = 10   b = 10   c = 18

Area: T = 39.23300904919
Perimeter: p = 38
Semiperimeter: s = 19

Angle ∠ A = α = 25.84219327632° = 25°50'31″ = 0.45110268118 rad
Angle ∠ B = β = 25.84219327632° = 25°50'31″ = 0.45110268118 rad
Angle ∠ C = γ = 128.3166134474° = 128°18'58″ = 2.243953903 rad

Height: ha = 7.84660180984
Height: hb = 7.84660180984
Height: hc = 4.35988989435

Median: ma = 13.67547943312
Median: mb = 13.67547943312
Median: mc = 4.35988989435

Inradius: r = 2.06547416048
Circumradius: R = 11.47107866935

Vertex coordinates: A[18; 0] B[0; 0] C[9; 4.35988989435]
Centroid: CG[9; 1.45329663145]
Coordinates of the circumscribed circle: U[9; -7.112188775]
Coordinates of the inscribed circle: I[9; 2.06547416048]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 154.1588067237° = 154°9'29″ = 0.45110268118 rad
∠ B' = β' = 154.1588067237° = 154°9'29″ = 0.45110268118 rad
∠ C' = γ' = 51.68438655263° = 51°41'2″ = 2.243953903 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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