# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse isosceles triangle.

Sides: a = 5.5   b = 5.5   c = 8.04

Area: T = 15.09895186086
Perimeter: p = 19.04
Semiperimeter: s = 9.52

Angle ∠ A = α = 43.03773394163° = 43°2'14″ = 0.75111432741 rad
Angle ∠ B = β = 43.03773394163° = 43°2'14″ = 0.75111432741 rad
Angle ∠ C = γ = 93.92553211675° = 93°55'31″ = 1.63993061054 rad

Height: ha = 5.48770976759
Height: hb = 5.48770976759
Height: hc = 3.75436115942

Median: ma = 6.31553226363
Median: mb = 6.31553226363
Median: mc = 3.75436115942

Inradius: r = 1.58550334673
Circumradius: R = 4.02994526006

Vertex coordinates: A[8.04; 0] B[0; 0] C[4.02; 3.75436115942]
Centroid: CG[4.02; 1.25112038647]
Coordinates of the circumscribed circle: U[4.02; -0.27658410065]
Coordinates of the inscribed circle: I[4.02; 1.58550334673]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 136.9632660584° = 136°57'46″ = 0.75111432741 rad
∠ B' = β' = 136.9632660584° = 136°57'46″ = 0.75111432741 rad
∠ C' = γ' = 86.07546788325° = 86°4'29″ = 1.63993061054 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   