Acute isosceles triangle.

Sides: a = 7   b = 18   c = 18

Area: T = 61.79875525405
Perimeter: p = 43
Semiperimeter: s = 21.5

Angle ∠ A = α = 22.42545428353° = 22°25'28″ = 0.39113821057 rad
Angle ∠ B = β = 78.78877285824° = 78°47'16″ = 1.37551052739 rad
Angle ∠ C = γ = 78.78877285824° = 78°47'16″ = 1.37551052739 rad

Height: h_a = 17.6566443583
Height: h_b = 6.86663947267
Height: h_c = 6.86663947267

Median: m_a = 17.6566443583
Median: m_b = 10.27113192921
Median: m_c = 10.27113192921

Inradius: r = 2.87443047693
Circumradius: R = 9.1755120643

Vertex coordinates: A[18; 0] B[0; 0] C[1.36111111111; 6.86663947267]
Centroid: CG[6.45437037037; 2.28987982422]
Coordinates of the circumscribed circle: U[9; 1.78440512361]
Coordinates of the inscribed circle: I[3.5; 2.87443047693]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 157.5755457165° = 157°34'32″ = 0.39113821057 rad
∠ B' = β' = 101.2122271418° = 101°12'44″ = 1.37551052739 rad
∠ C' = γ' = 101.2122271418° = 101°12'44″ = 1.37551052739 rad

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