Acute isosceles triangle.

Sides: a = 2   b = 9   c = 9

Area: T = 8.944427191
Perimeter: p = 20
Semiperimeter: s = 10

Angle ∠ A = α = 12.75987404169° = 12°45'31″ = 0.22326820287 rad
Angle ∠ B = β = 83.62106297916° = 83°37'14″ = 1.45994553125 rad
Angle ∠ C = γ = 83.62106297916° = 83°37'14″ = 1.45994553125 rad

Height: h_a = 8.944427191
Height: h_b = 1.988761598
Height: h_c = 1.988761598

Median: m_a = 8.944427191
Median: m_b = 4.7176990566
Median: m_c = 4.7176990566

Inradius: r = 0.8944427191
Circumradius: R = 4.52880376544

Vertex coordinates: A[9; 0] B[0; 0] C[0.22222222222; 1.988761598]
Centroid: CG[3.07440740741; 0.663253866]
Coordinates of the circumscribed circle: U[4.5; 0.50331152949]
Coordinates of the inscribed circle: I[1; 0.8944427191]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 167.2411259583° = 167°14'29″ = 0.22326820287 rad
∠ B' = β' = 96.37993702084° = 96°22'46″ = 1.45994553125 rad
∠ C' = γ' = 96.37993702084° = 96°22'46″ = 1.45994553125 rad

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