11 11 21 triangle

Obtuse isosceles triangle.

Sides: a = 11   b = 11   c = 21

Area: T = 34.42765522526
Perimeter: p = 43
Semiperimeter: s = 21.5

Angle ∠ A = α = 17.34114428028° = 17°20'29″ = 0.3032665274 rad
Angle ∠ B = β = 17.34114428028° = 17°20'29″ = 0.3032665274 rad
Angle ∠ C = γ = 145.3177114394° = 145°19'2″ = 2.53662621057 rad

Height: ha = 6.25993731368
Height: hb = 6.25993731368
Height: hc = 3.27987192622

Median: ma = 15.83550876221
Median: mb = 15.83550876221
Median: mc = 3.27987192622

Inradius: r = 1.60112349885
Circumradius: R = 18.45223270102

Vertex coordinates: A[21; 0] B[0; 0] C[10.5; 3.27987192622]
Centroid: CG[10.5; 1.09329064207]
Coordinates of the circumscribed circle: U[10.5; -15.17436077481]
Coordinates of the inscribed circle: I[10.5; 1.60112349885]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 162.6598557197° = 162°39'31″ = 0.3032665274 rad
∠ B' = β' = 162.6598557197° = 162°39'31″ = 0.3032665274 rad
∠ C' = γ' = 34.68328856055° = 34°40'58″ = 2.53662621057 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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