18 18 26 triangle

Obtuse isosceles triangle.

Sides: a = 18   b = 18   c = 26

Area: T = 161.8498694774
Perimeter: p = 62
Semiperimeter: s = 31

Angle ∠ A = α = 43.76217426927° = 43°45'42″ = 0.76437864964 rad
Angle ∠ B = β = 43.76217426927° = 43°45'42″ = 0.76437864964 rad
Angle ∠ C = γ = 92.47765146146° = 92°28'35″ = 1.61440196608 rad

Height: ha = 17.98331883082
Height: hb = 17.98331883082
Height: hc = 12.4549899598

Median: ma = 20.46994894905
Median: mb = 20.46994894905
Median: mc = 12.4549899598

Inradius: r = 5.22109256379
Circumradius: R = 13.01221531282

Vertex coordinates: A[26; 0] B[0; 0] C[13; 12.4549899598]
Centroid: CG[13; 4.15499665327]
Coordinates of the circumscribed circle: U[13; -0.56222535302]
Coordinates of the inscribed circle: I[13; 5.22109256379]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 136.2388257307° = 136°14'18″ = 0.76437864964 rad
∠ B' = β' = 136.2388257307° = 136°14'18″ = 0.76437864964 rad
∠ C' = γ' = 87.52334853854° = 87°31'25″ = 1.61440196608 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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