# Triangle calculator SSS - result

Please enter the triangle sides:

### Acute isosceles triangle.

Sides: a = 3   b = 6   c = 6

Area: T = 8.7144212529
Perimeter: p = 15
Semiperimeter: s = 7.5

Angle ∠ A = α = 28.95550243719° = 28°57'18″ = 0.50553605103 rad
Angle ∠ B = β = 75.52224878141° = 75°31'21″ = 1.31881160717 rad
Angle ∠ C = γ = 75.52224878141° = 75°31'21″ = 1.31881160717 rad

Height: ha = 5.80994750193
Height: hb = 2.90547375097
Height: hc = 2.90547375097

Median: ma = 5.80994750193
Median: mb = 3.67442346142
Median: mc = 3.67442346142

Inradius: r = 1.16218950039
Circumradius: R = 3.0988386677

Vertex coordinates: A[6; 0] B[0; 0] C[0.75; 2.90547375097]
Centroid: CG[2.25; 0.96882458366]
Coordinates of the circumscribed circle: U[3; 0.77545966692]
Coordinates of the inscribed circle: I[1.5; 1.16218950039]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 151.0454975628° = 151°2'42″ = 0.50553605103 rad
∠ B' = β' = 104.4787512186° = 104°28'39″ = 1.31881160717 rad
∠ C' = γ' = 104.4787512186° = 104°28'39″ = 1.31881160717 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    