# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse isosceles triangle.

Sides: a = 13   b = 13   c = 25

Area: T = 44.63439276784
Perimeter: p = 51
Semiperimeter: s = 25.5

Angle ∠ A = α = 15.94223686056° = 15°56'33″ = 0.27882468227 rad
Angle ∠ B = β = 15.94223686056° = 15°56'33″ = 0.27882468227 rad
Angle ∠ C = γ = 148.1155262789° = 148°6'55″ = 2.58550990081 rad

Height: ha = 6.86767581044
Height: hb = 6.86767581044
Height: hc = 3.57107142143

Median: ma = 18.83548082018
Median: mb = 18.83548082018
Median: mc = 3.57107142143

Inradius: r = 1.7550350105
Circumradius: R = 23.66547334201

Vertex coordinates: A[25; 0] B[0; 0] C[12.5; 3.57107142143]
Centroid: CG[12.5; 1.19902380714]
Coordinates of the circumscribed circle: U[12.5; -20.09440192058]
Coordinates of the inscribed circle: I[12.5; 1.7550350105]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 164.0587631394° = 164°3'27″ = 0.27882468227 rad
∠ B' = β' = 164.0587631394° = 164°3'27″ = 0.27882468227 rad
∠ C' = γ' = 31.88547372113° = 31°53'5″ = 2.58550990081 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 ### 6. Inradius ### 7. Circumradius ### 8. Calculation of medians #### Look also our friend's collection of math examples and problems:

See more informations about triangles or more information about solving triangles.