Triangle calculator VC

Please enter the coordinates of the three vertices

Right isosceles triangle.

Sides: a = 4.12331056256   b = 4.12331056256   c = 5.83109518948

Area: T = 8.5
Perimeter: p = 14.07771631461
Semiperimeter: s = 7.0398581573

Angle ∠ A = α = 45° = 0.78553981634 rad
Angle ∠ B = β = 45° = 0.78553981634 rad
Angle ∠ C = γ = 90° = 1.57107963268 rad

Height: ha = 4.12331056256
Height: hb = 4.12331056256
Height: hc = 2.91554759474

Median: ma = 4.61097722286
Median: mb = 4.61097722286
Median: mc = 2.91554759474

Inradius: r = 1.20876296782
Circumradius: R = 2.91554759474

Vertex coordinates: A[3; -3] B[8; 0] C[4; 1]
Centroid: CG[5; -0.66766666667]
Coordinates of the circumscribed circle: U[0; 0]
Coordinates of the inscribed circle: I[1.20876296782; 1.20876296782]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 135° = 0.78553981634 rad
∠ B' = β' = 135° = 0.78553981634 rad
∠ C' = γ' = 90° = 1.57107963268 rad

How did we calculate this triangle?

1. We compute side a from coordinates using the Pythagorean theorem 2. We compute side b from coordinates using the Pythagorean theorem 3. We compute side c from coordinates using the Pythagorean theorem 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. 4. The triangle circumference is the sum of the lengths of its three sides 5. Semiperimeter of the triangle 6. The triangle area using Heron's formula 7. Calculate the heights of the triangle from its area. 8. Calculation of the inner angles of the triangle using a Law of Cosines     