Triangle calculator SSS - result

Please enter the triangle sides:

Obtuse scalene triangle.

Sides: a = 42   b = 33   c = 15.9

Area: T = 240.1821697354
Perimeter: p = 90.9
Semiperimeter: s = 45.45

Angle ∠ A = α = 113.7233018408° = 113°43'23″ = 1.98548411065 rad
Angle ∠ B = β = 45.99985519834° = 45°59'55″ = 0.80328261833 rad
Angle ∠ C = γ = 20.27884296084° = 20°16'42″ = 0.35439253638 rad

Height: ha = 11.43772236835
Height: hb = 14.55664665063
Height: hc = 30.21215342583

Median: ma = 15.16326185074
Median: mb = 27.132217647
Median: mc = 36.92328587734

Inradius: r = 5.28545257944
Circumradius: R = 22.93882590793

Vertex coordinates: A[15.9; 0] B[0; 0] C[29.17664150943; 30.21215342583]
Centroid: CG[15.02554716981; 10.07105114194]
Coordinates of the circumscribed circle: U[7.95; 21.51765338656]
Coordinates of the inscribed circle: I[12.45; 5.28545257944]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 66.27769815918° = 66°16'37″ = 1.98548411065 rad
∠ B' = β' = 134.0011448017° = 134°5″ = 0.80328261833 rad
∠ C' = γ' = 159.7221570392° = 159°43'18″ = 0.35439253638 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     