12 21 26 triangle

Obtuse scalene triangle.

Sides: a = 12   b = 21   c = 26

Area: T = 123.9299163234
Perimeter: p = 59
Semiperimeter: s = 29.5

Angle ∠ A = α = 26.99875872637° = 26°59'51″ = 0.47111967878 rad
Angle ∠ B = β = 52.66002917273° = 52°36'1″ = 0.91880482782 rad
Angle ∠ C = γ = 100.4022121009° = 100°24'8″ = 1.75223475876 rad

Height: ha = 20.65548605391
Height: hb = 11.80327774509
Height: hc = 9.53330125565

Median: ma = 22.85882589013
Median: mb = 17.31332896932
Median: mc = 11.11330553854

Inradius: r = 4.20109885842
Circumradius: R = 13.2177227949

Vertex coordinates: A[26; 0] B[0; 0] C[7.28884615385; 9.53330125565]
Centroid: CG[11.09661538462; 3.17876708522]
Coordinates of the circumscribed circle: U[13; -2.38664439352]
Coordinates of the inscribed circle: I[8.5; 4.20109885842]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 153.0022412736° = 153°9″ = 0.47111967878 rad
∠ B' = β' = 127.4399708273° = 127°23'59″ = 0.91880482782 rad
∠ C' = γ' = 79.5987878991° = 79°35'52″ = 1.75223475876 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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