Triangle calculator

Please enter what you know about the triangle:
You have entered side a, b and c.

Obtuse isosceles triangle.

Sides: a = 4.7   b = 4.7   c = 8.47

Area: T = 8.632231281
Perimeter: p = 17.87
Semiperimeter: s = 8.935

Angle ∠ A = α = 25.70217428331° = 25°42'6″ = 0.44985800359 rad
Angle ∠ B = β = 25.70217428331° = 25°42'6″ = 0.44985800359 rad
Angle ∠ C = γ = 128.5976514334° = 128°35'47″ = 2.24444325817 rad

Height: ha = 3.67333246
Height: hb = 3.67333246
Height: hc = 2.03883265195

Median: ma = 6.4343735307
Median: mb = 6.4343735307
Median: mc = 2.03883265195

Inradius: r = 0.96661234259
Circumradius: R = 5.41986607957

Vertex coordinates: A[8.47; 0] B[0; 0] C[4.235; 2.03883265195]
Centroid: CG[4.235; 0.67994421732]
Coordinates of the circumscribed circle: U[4.235; -3.38803342763]
Coordinates of the inscribed circle: I[4.235; 0.96661234259]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 154.2988257167° = 154°17'54″ = 0.44985800359 rad
∠ B' = β' = 154.2988257167° = 154°17'54″ = 0.44985800359 rad
∠ C' = γ' = 51.40334856661° = 51°24'13″ = 2.24444325817 rad

How did we calculate this triangle?

1. Input data entered: side a, b and c. 2. The triangle circumference is the sum of the lengths of its three sides 3. Semiperimeter of the triangle 4. The triangle area using Heron's formula 5. Calculate the heights of the triangle from its area. 6. Calculation of the inner angles of the triangle using a Law of Cosines     