Triangle calculator SSS - result

Please enter the triangle sides:

Obtuse scalene triangle.

Sides: a = 13.1   b = 8.7   c = 5.53

Area: T = 17.65990545033
Perimeter: p = 27.33
Semiperimeter: s = 13.665

Angle ∠ A = α = 132.7699086939° = 132°46'9″ = 2.3177257712 rad
Angle ∠ B = β = 29.17883402617° = 29°10'42″ = 0.50992581078 rad
Angle ∠ C = γ = 18.05325727993° = 18°3'9″ = 0.31550768338 rad

Height: ha = 2.69660388555
Height: hb = 4.06595527594
Height: hc = 6.38766381567

Median: ma = 3.19988982478
Median: mb = 9.06549296743
Median: mc = 10.77105512858

Inradius: r = 1.29222835348
Circumradius: R = 8.92325346108

Vertex coordinates: A[5.53; 0] B[0; 0] C[11.43876943942; 6.38766381567]
Centroid: CG[5.65658981314; 2.12988793856]
Coordinates of the circumscribed circle: U[2.765; 8.48333011783]
Coordinates of the inscribed circle: I[4.965; 1.29222835348]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 47.23109130611° = 47°13'51″ = 2.3177257712 rad
∠ B' = β' = 150.8221659738° = 150°49'18″ = 0.50992581078 rad
∠ C' = γ' = 161.9477427201° = 161°56'51″ = 0.31550768338 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     