# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 16   b = 18   c = 28

Area: T = 134.6666254125
Perimeter: p = 62
Semiperimeter: s = 31

Angle ∠ A = α = 32.30325452092° = 32°18'9″ = 0.56437857707 rad
Angle ∠ B = β = 36.95550748363° = 36°57'18″ = 0.64549877312 rad
Angle ∠ C = γ = 110.7422379954° = 110°44'33″ = 1.93328191517 rad

Height: ha = 16.83332817656
Height: hb = 14.9632917125
Height: hc = 9.61990181518

Median: ma = 22.13659436212
Median: mb = 20.95223268398
Median: mc = 9.69553597148

Inradius: r = 4.34440727137
Circumradius: R = 14.97703428903

Vertex coordinates: A[28; 0] B[0; 0] C[12.78657142857; 9.61990181518]
Centroid: CG[13.59552380952; 3.20663393839]
Coordinates of the circumscribed circle: U[14; -5.30219964403]
Coordinates of the inscribed circle: I[13; 4.34440727137]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 147.6977454791° = 147°41'51″ = 0.56437857707 rad
∠ B' = β' = 143.0454925164° = 143°2'42″ = 0.64549877312 rad
∠ C' = γ' = 69.25876200455° = 69°15'27″ = 1.93328191517 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    