18 21 26 triangle

Acute scalene triangle.

Sides: a = 18   b = 21   c = 26

Area: T = 187.6865741334
Perimeter: p = 65
Semiperimeter: s = 32.5

Angle ∠ A = α = 43.43220282875° = 43°25'55″ = 0.75880318944 rad
Angle ∠ B = β = 53.32987880616° = 53°19'44″ = 0.93107629378 rad
Angle ∠ C = γ = 83.23991836509° = 83°14'21″ = 1.45327978214 rad

Height: ha = 20.85439712593
Height: hb = 17.8754832508
Height: hc = 14.4377364718

Median: ma = 21.85217733834
Median: mb = 19.74220870224
Median: mc = 14.61216391962

Inradius: r = 5.77549458872
Circumradius: R = 13.09110317563

Vertex coordinates: A[26; 0] B[0; 0] C[10.75; 14.4377364718]
Centroid: CG[12.25; 4.8122454906]
Coordinates of the circumscribed circle: U[13; 1.54111399819]
Coordinates of the inscribed circle: I[11.5; 5.77549458872]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 136.5687971712° = 136°34'5″ = 0.75880318944 rad
∠ B' = β' = 126.6711211938° = 126°40'16″ = 0.93107629378 rad
∠ C' = γ' = 96.76108163491° = 96°45'39″ = 1.45327978214 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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