20 20 21 triangle

Acute isosceles triangle.

Sides: a = 20   b = 20   c = 21

Area: T = 178.7311467571
Perimeter: p = 61
Semiperimeter: s = 30.5

Angle ∠ A = α = 58.33217567465° = 58°19'54″ = 1.01880812137 rad
Angle ∠ B = β = 58.33217567465° = 58°19'54″ = 1.01880812137 rad
Angle ∠ C = γ = 63.33664865071° = 63°20'11″ = 1.10554302262 rad

Height: ha = 17.87331467571
Height: hb = 17.87331467571
Height: hc = 17.02220445305

Median: ma = 17.903251379
Median: mb = 17.903251379
Median: mc = 17.02220445305

Inradius: r = 5.86600481171
Circumradius: R = 11.74994699089

Vertex coordinates: A[21; 0] B[0; 0] C[10.5; 17.02220445305]
Centroid: CG[10.5; 5.67440148435]
Coordinates of the circumscribed circle: U[10.5; 5.27325746216]
Coordinates of the inscribed circle: I[10.5; 5.86600481171]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 121.6688243254° = 121°40'6″ = 1.01880812137 rad
∠ B' = β' = 121.6688243254° = 121°40'6″ = 1.01880812137 rad
∠ C' = γ' = 116.6643513493° = 116°39'49″ = 1.10554302262 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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