# Triangle calculator SSS - result

### Obtuse isosceles triangle.

Sides: a = 7.81   b = 11.05   c = 7.81

Area: T = 30.49880375339
Perimeter: p = 26.67
Semiperimeter: s = 13.335

Angle ∠ A = α = 44.97440978303° = 44°58'27″ = 0.78549460853 rad
Angle ∠ B = β = 90.05218043395° = 90°3'6″ = 1.57217004831 rad
Angle ∠ C = γ = 44.97440978303° = 44°58'27″ = 0.78549460853 rad

Height: ha = 7.81099968077
Height: hb = 5.52200067935
Height: hc = 7.81099968077

Median: ma = 8.7355002862
Median: mb = 5.52200067935
Median: mc = 8.7355002862

Vertex coordinates: A[7.81; 0] B[0; 0] C[-0.00770614597; 7.81099968077]
Centroid: CG[2.60109795134; 2.60333322692]
Coordinates of the circumscribed circle: U[3.905; 3.90985323274]
Coordinates of the inscribed circle: I[2.285; 2.28770669317]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 135.026590217° = 135°1'33″ = 0.78549460853 rad
∠ B' = β' = 89.94881956605° = 89°56'54″ = 1.57217004831 rad
∠ C' = γ' = 135.026590217° = 135°1'33″ = 0.78549460853 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    