Triangle calculator

Please enter what you know about the triangle:
Symbols definition of ABC triangle

You have entered side a, b and c (as equilateral triangle).

Acute isosceles triangle.

Sides: a = 66   b = 66   c = 77

Area: T = 2063.884370251
Perimeter: p = 209
Semiperimeter: s = 104.5

Angle ∠ A = α = 54.31546652873° = 54°18'53″ = 0.94879697414 rad
Angle ∠ B = β = 54.31546652873° = 54°18'53″ = 0.94879697414 rad
Angle ∠ C = γ = 71.37106694253° = 71°22'14″ = 1.24656531708 rad

Height: ha = 62.54219303792
Height: hb = 62.54219303792
Height: hc = 53.60773688964

Median: ma = 63.66771029653
Median: mb = 63.66771029653
Median: mc = 53.60773688964

Inradius: r = 19.75500832776
Circumradius: R = 40.62987427426

Vertex coordinates: A[77; 0] B[0; 0] C[38.5; 53.60773688964]
Centroid: CG[38.5; 17.86991229655]
Coordinates of the circumscribed circle: U[38.5; 12.97986261539]
Coordinates of the inscribed circle: I[38.5; 19.75500832776]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 125.6855334713° = 125°41'7″ = 0.94879697414 rad
∠ B' = β' = 125.6855334713° = 125°41'7″ = 0.94879697414 rad
∠ C' = γ' = 108.6299330575° = 108°37'46″ = 1.24656531708 rad

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How did we calculate this triangle?

1. Input data entered: side a, b and c (as equilateral triangle).


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