Triangle calculator

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

Obtuse isosceles triangle.

Sides: a = 4.5   b = 4.5   c = 6.64

Area: T = 10.08551523657
Perimeter: p = 15.64
Semiperimeter: s = 7.82

Angle ∠ A = α = 42.45875411892° = 42°27'27″ = 0.74110238861 rad
Angle ∠ B = β = 42.45875411892° = 42°27'27″ = 0.74110238861 rad
Angle ∠ C = γ = 95.08549176216° = 95°5'6″ = 1.66595448815 rad

Height: ha = 4.48222899403
Height: hb = 4.48222899403
Height: hc = 3.03876964957

Median: ma = 5.20664671323
Median: mb = 5.20664671323
Median: mc = 3.03876964957

Inradius: r = 1.29896614278
Circumradius: R = 3.33331177141

Vertex coordinates: A[6.64; 0] B[0; 0] C[3.32; 3.03876964957]
Centroid: CG[3.32; 1.01325654986]
Coordinates of the circumscribed circle: U[3.32; -0.29554212184]
Coordinates of the inscribed circle: I[3.32; 1.29896614278]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 137.5422458811° = 137°32'33″ = 0.74110238861 rad
∠ B' = β' = 137.5422458811° = 137°32'33″ = 0.74110238861 rad
∠ C' = γ' = 84.91550823784° = 84°54'54″ = 1.66595448815 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     