# Triangle calculator SSS - result

Please enter the triangle sides:

### Acute isosceles triangle.

Sides: a = 78   b = 78   c = 65.93

Area: T = 2330.355010125
Perimeter: p = 221.93
Semiperimeter: s = 110.965

Angle ∠ A = α = 64.99993713884° = 64°59'58″ = 1.13444530425 rad
Angle ∠ B = β = 64.99993713884° = 64°59'58″ = 1.13444530425 rad
Angle ∠ C = γ = 50.00112572232° = 50°5″ = 0.87326865687 rad

Height: ha = 59.75325666988
Height: hb = 59.75325666988
Height: hc = 70.69216457228

Median: ma = 60.78114317864
Median: mb = 60.78114317864
Median: mc = 70.69216457228

Inradius: r = 21.00107669198
Circumradius: R = 43.03219589945

Vertex coordinates: A[65.93; 0] B[0; 0] C[32.965; 70.69216457228]
Centroid: CG[32.965; 23.56438819076]
Coordinates of the circumscribed circle: U[32.965; 27.66596867283]
Coordinates of the inscribed circle: I[32.965; 21.00107669198]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 115.0010628612° = 115°2″ = 1.13444530425 rad
∠ B' = β' = 115.0010628612° = 115°2″ = 1.13444530425 rad
∠ C' = γ' = 129.9998742777° = 129°59'55″ = 0.87326865687 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   