2 9 9 triangle

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: ha = 8.944427191
Height: hb = 1.988761598
Height: hc = 1.988761598

Median: ma = 8.944427191
Median: mb = 4.7176990566
Median: mc = 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

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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