Triangle calculator SSS - result

Please enter the triangle sides:

Acute isosceles triangle.

Sides: a = 13   b = 16   c = 16

Area: T = 95.03112448619
Perimeter: p = 45
Semiperimeter: s = 22.5

Angle ∠ A = α = 47.93989646355° = 47°56'20″ = 0.83766927729 rad
Angle ∠ B = β = 66.03105176822° = 66°1'50″ = 1.15224499404 rad
Angle ∠ C = γ = 66.03105176822° = 66°1'50″ = 1.15224499404 rad

Height: ha = 14.62201915172
Height: hb = 11.87989056077
Height: hc = 11.87989056077

Median: ma = 14.62201915172
Median: mb = 12.1866057607
Median: mc = 12.1866057607

Inradius: r = 4.22436108828
Circumradius: R = 8.75550152711

Vertex coordinates: A[16; 0] B[0; 0] C[5.281125; 11.87989056077]
Centroid: CG[7.094375; 3.96596352026]
Coordinates of the circumscribed circle: U[8; 3.55767249539]
Coordinates of the inscribed circle: I[6.5; 4.22436108828]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 132.0611035364° = 132°3'40″ = 0.83766927729 rad
∠ B' = β' = 113.9699482318° = 113°58'10″ = 1.15224499404 rad
∠ C' = γ' = 113.9699482318° = 113°58'10″ = 1.15224499404 rad

How did we calculate this triangle?

1. The triangle circumference is the sum of the lengths of its three sides 2. Semiperimeter of the triangle 3. The triangle area using Heron's formula 4. Calculate the heights of the triangle from its area. 5. Calculation of the inner angles of the triangle using a Law of Cosines     