Triangle calculator SSS - result

Please enter the triangle sides:

Obtuse scalene triangle.

Sides: a = 16   b = 20   c = 26

Area: T = 159.9221855917
Perimeter: p = 62
Semiperimeter: s = 31

Angle ∠ A = α = 37.95880285807° = 37°57'29″ = 0.66224925763 rad
Angle ∠ B = β = 50.251118676° = 50°15'4″ = 0.8777048662 rad
Angle ∠ C = γ = 91.79107846593° = 91°47'27″ = 1.60220514153 rad

Height: ha = 19.99902319896
Height: hb = 15.99221855917
Height: hc = 12.30216812244

Median: ma = 21.77215410571
Median: mb = 19.13111264697
Median: mc = 12.61095202129

Inradius: r = 5.15987695457
Circumradius: R = 13.00663523092

Vertex coordinates: A[26; 0] B[0; 0] C[10.23107692308; 12.30216812244]
Centroid: CG[12.07769230769; 4.10105604081]
Coordinates of the circumscribed circle: U[13; -0.40664485097]
Coordinates of the inscribed circle: I[11; 5.15987695457]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 142.0421971419° = 142°2'31″ = 0.66224925763 rad
∠ B' = β' = 129.749881324° = 129°44'56″ = 0.8777048662 rad
∠ C' = γ' = 88.20992153407° = 88°12'33″ = 1.60220514153 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     