Triangle calculator SSS - result

Please enter the triangle sides:

Obtuse scalene triangle.

Sides: a = 18.7   b = 3.31   c = 16.1

Area: T = 17.74106173314
Perimeter: p = 38.11
Semiperimeter: s = 19.055

Angle ∠ A = α = 138.256614632° = 138°15'22″ = 2.41330249644 rad
Angle ∠ B = β = 6.76880620617° = 6°46'5″ = 0.1188124967 rad
Angle ∠ C = γ = 34.97657916186° = 34°58'33″ = 0.61104427222 rad

Height: ha = 1.8977392228
Height: hb = 10.71994062425
Height: hc = 2.20438033952

Median: ma = 6.90436620717
Median: mb = 17.37698294465
Median: mc = 10.74880486601

Inradius: r = 0.9311021639
Circumradius: R = 14.04332218533

Vertex coordinates: A[16.1; 0] B[0; 0] C[18.57696863354; 2.20438033952]
Centroid: CG[11.55765621118; 0.73546011317]
Coordinates of the circumscribed circle: U[8.05; 11.50769361701]
Coordinates of the inscribed circle: I[15.745; 0.9311021639]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 41.74438536803° = 41°44'38″ = 2.41330249644 rad
∠ B' = β' = 173.2321937938° = 173°13'55″ = 0.1188124967 rad
∠ C' = γ' = 145.0244208381° = 145°1'27″ = 0.61104427222 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     