# Triangle calculator SSS - result

Please enter the triangle sides:

### Acute isosceles triangle.

Sides: a = 4.47   b = 4.47   c = 2.83

Area: T = 65.9997793753
Perimeter: p = 11.77
Semiperimeter: s = 5.885

Angle ∠ A = α = 71.5455298212° = 71°32'43″ = 1.24987010181 rad
Angle ∠ B = β = 71.5455298212° = 71°32'43″ = 1.24987010181 rad
Angle ∠ C = γ = 36.90994035761° = 36°54'34″ = 0.64441906173 rad

Height: ha = 2.68444650449
Height: hb = 2.68444650449
Height: hc = 4.2440126767

Median: ma = 32.9999458328
Median: mb = 32.9999458328
Median: mc = 4.2440126767

Inradius: r = 1.02195037171
Circumradius: R = 2.35661677631

Vertex coordinates: A[2.83; 0] B[0; 0] C[1.415; 4.2440126767]
Centroid: CG[1.415; 1.4133375589]
Coordinates of the circumscribed circle: U[1.415; 1.88439590038]
Coordinates of the inscribed circle: I[1.415; 1.02195037171]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 108.4554701788° = 108°27'17″ = 1.24987010181 rad
∠ B' = β' = 108.4554701788° = 108°27'17″ = 1.24987010181 rad
∠ C' = γ' = 143.0910596424° = 143°5'26″ = 0.64441906173 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    