# Triangle calculator SSS - result

Please enter the triangle sides:

### Acute isosceles triangle.

Sides: a = 5.1   b = 3.61   c = 3.61

Area: T = 6.51660359115
Perimeter: p = 12.32
Semiperimeter: s = 6.16

Angle ∠ A = α = 89.88108544483° = 89°52'51″ = 1.56987168446 rad
Angle ∠ B = β = 45.06595727758° = 45°3'34″ = 0.78664379045 rad
Angle ∠ C = γ = 45.06595727758° = 45°3'34″ = 0.78664379045 rad

Height: ha = 2.55553082006
Height: hb = 3.61099921947
Height: hc = 3.61099921947

Median: ma = 2.55553082006
Median: mb = 4.0332744103
Median: mc = 4.0332744103

Inradius: r = 1.05877980376
Circumradius: R = 2.55500055134

Vertex coordinates: A[3.61; 0] B[0; 0] C[3.60224930748; 3.61099921947]
Centroid: CG[2.40441643583; 1.20333307316]
Coordinates of the circumscribed circle: U[1.805; 1.80112504319]
Coordinates of the inscribed circle: I[2.55; 1.05877980376]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 90.11991455517° = 90°7'9″ = 1.56987168446 rad
∠ B' = β' = 134.9440427224° = 134°56'26″ = 0.78664379045 rad
∠ C' = γ' = 134.9440427224° = 134°56'26″ = 0.78664379045 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    