# Triangle calculator SSS - result

Please enter the triangle sides:

### Acute isosceles triangle.

Sides: a = 26   b = 30   c = 30

Area: T = 351.48111517
Perimeter: p = 86
Semiperimeter: s = 43

Angle ∠ A = α = 51.35985772389° = 51°21'31″ = 0.8966376272 rad
Angle ∠ B = β = 64.32107113805° = 64°19'15″ = 1.12326081908 rad
Angle ∠ C = γ = 64.32107113805° = 64°19'15″ = 1.12326081908 rad

Height: ha = 27.03770116692
Height: hb = 23.432207678
Height: hc = 23.432207678

Median: ma = 27.03770116692
Median: mb = 23.72876210354
Median: mc = 23.72876210354

Inradius: r = 8.17439802721
Circumradius: R = 16.64438512327

Vertex coordinates: A[30; 0] B[0; 0] C[11.26766666667; 23.432207678]
Centroid: CG[13.75655555556; 7.811069226]
Coordinates of the circumscribed circle: U[15; 7.21223355342]
Coordinates of the inscribed circle: I[13; 8.17439802721]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 128.6411422761° = 128°38'29″ = 0.8966376272 rad
∠ B' = β' = 115.6799288619° = 115°40'45″ = 1.12326081908 rad
∠ C' = γ' = 115.6799288619° = 115°40'45″ = 1.12326081908 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    