# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 12.65   b = 11.31   c = 5.66

Area: T = 32.0077295106
Perimeter: p = 29.62
Semiperimeter: s = 14.81

Angle ∠ A = α = 90.03216845016° = 90°1'54″ = 1.57113493257 rad
Angle ∠ B = β = 63.38993521124° = 63°23'22″ = 1.10663529051 rad
Angle ∠ C = γ = 26.5798963386° = 26°34'44″ = 0.46438904229 rad

Height: ha = 5.0660441914
Height: hb = 5.66599991346
Height: hc = 11.31099982707

Median: ma = 6.32222009617
Median: mb = 8.00331259518
Median: mc = 11.66602058301

Inradius: r = 2.1611194808
Circumradius: R = 6.32550009671

Vertex coordinates: A[5.66; 0] B[0; 0] C[5.6666254417; 11.31099982707]
Centroid: CG[3.7755418139; 3.77699994236]
Coordinates of the circumscribed circle: U[2.83; 5.65765658516]
Coordinates of the inscribed circle: I[3.5; 2.1611194808]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 89.96883154984° = 89°58'6″ = 1.57113493257 rad
∠ B' = β' = 116.6110647888° = 116°36'38″ = 1.10663529051 rad
∠ C' = γ' = 153.4211036614° = 153°25'16″ = 0.46438904229 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    