# Triangle calculator SSS - result

Please enter the triangle sides:

### Acute isosceles triangle.

Sides: a = 8.39   b = 8.39   c = 4.06

Area: T = 16.5265646374
Perimeter: p = 20.84
Semiperimeter: s = 10.42

Angle ∠ A = α = 75.99880624266° = 75°59'53″ = 1.32664164145 rad
Angle ∠ B = β = 75.99880624266° = 75°59'53″ = 1.32664164145 rad
Angle ∠ C = γ = 28.00438751467° = 28°14″ = 0.48987598246 rad

Height: ha = 3.93993674312
Height: hb = 3.93993674312
Height: hc = 8.14107124995

Median: ma = 5.08332887976
Median: mb = 5.08332887976
Median: mc = 8.14107124995

Inradius: r = 1.58659545465
Circumradius: R = 4.3233460631

Vertex coordinates: A[4.06; 0] B[0; 0] C[2.03; 8.14107124995]
Centroid: CG[2.03; 2.71435708332]
Coordinates of the circumscribed circle: U[2.03; 3.81772518685]
Coordinates of the inscribed circle: I[2.03; 1.58659545465]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 104.0021937573° = 104°7″ = 1.32664164145 rad
∠ B' = β' = 104.0021937573° = 104°7″ = 1.32664164145 rad
∠ C' = γ' = 151.9966124853° = 151°59'46″ = 0.48987598246 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   