Triangle calculator VC

Please enter the coordinates of the three vertices


Obtuse isosceles triangle.

Sides: a = 12.72879220614   b = 6.70882039325   c = 6.70882039325

Area: T = 13.5
Perimeter: p = 26.14443299264
Semiperimeter: s = 13.07221649632

Angle ∠ A = α = 143.1330102354° = 143°7'48″ = 2.49880915448 rad
Angle ∠ B = β = 18.43549488229° = 18°26'6″ = 0.32217505544 rad
Angle ∠ C = γ = 18.43549488229° = 18°26'6″ = 0.32217505544 rad

Height: ha = 2.12113203436
Height: hb = 4.02549223595
Height: hc = 4.02549223595

Median: ma = 2.12113203436
Median: mb = 9.60546863561
Median: mc = 9.60546863561

Inradius: r = 1.03327287055
Circumradius: R = 10.60766017178

Vertex coordinates: A[-2; -1] B[1; 5] C[-8; -4]
Centroid: CG[-3; 0]
Coordinates of the circumscribed circle: U[0; 0]
Coordinates of the inscribed circle: I[3.09881861164; 1.03327287055]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 36.87698976458° = 36°52'12″ = 2.49880915448 rad
∠ B' = β' = 161.5655051177° = 161°33'54″ = 0.32217505544 rad
∠ C' = γ' = 161.5655051177° = 161°33'54″ = 0.32217505544 rad

Calculate another triangle




How did we calculate this triangle?

1. We compute side a from coordinates using the Pythagorean theorem


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