# Triangle calculator SSS - result

Please enter the triangle sides:

### Acute isosceles triangle.

Sides: a = 8   b = 8   c = 10

Area: T = 31.2254989992
Perimeter: p = 26
Semiperimeter: s = 13

Angle ∠ A = α = 51.31878125465° = 51°19'4″ = 0.89656647939 rad
Angle ∠ B = β = 51.31878125465° = 51°19'4″ = 0.89656647939 rad
Angle ∠ C = γ = 77.3644374907° = 77°21'52″ = 1.35502630659 rad

Height: ha = 7.8066247498
Height: hb = 7.8066247498
Height: hc = 6.24549979984

Median: ma = 8.12440384046
Median: mb = 8.12440384046
Median: mc = 6.24549979984

Inradius: r = 2.40219223071
Circumradius: R = 5.12441009218

Vertex coordinates: A[10; 0] B[0; 0] C[5; 6.24549979984]
Centroid: CG[5; 2.08216659995]
Coordinates of the circumscribed circle: U[5; 1.12108970766]
Coordinates of the inscribed circle: I[5; 2.40219223071]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 128.6822187453° = 128°40'56″ = 0.89656647939 rad
∠ B' = β' = 128.6822187453° = 128°40'56″ = 0.89656647939 rad
∠ C' = γ' = 102.6365625093° = 102°38'8″ = 1.35502630659 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    