16 20 28 triangle
Obtuse scalene triangle.
Sides: a = 16 b = 20 c = 28Area: T = 156.7677343538
Perimeter: p = 64
Semiperimeter: s = 32
Angle ∠ A = α = 34.048773237° = 34°2'52″ = 0.59442450327 rad
Angle ∠ B = β = 44.41553085972° = 44°24'55″ = 0.77551933733 rad
Angle ∠ C = γ = 101.5376959033° = 101°32'13″ = 1.77221542476 rad
Height: ha = 19.59659179423
Height: hb = 15.67767343538
Height: hc = 11.19876673956
Median: ma = 22.97882505862
Median: mb = 20.49439015319
Median: mc = 11.48991252931
Inradius: r = 4.89989794856
Circumradius: R = 14.28986901662
Vertex coordinates: A[28; 0] B[0; 0] C[11.42985714286; 11.19876673956]
Centroid: CG[13.14328571429; 3.73325557985]
Coordinates of the circumscribed circle: U[14; -2.85877380332]
Coordinates of the inscribed circle: I[12; 4.89989794856]
Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 145.952226763° = 145°57'8″ = 0.59442450327 rad
∠ B' = β' = 135.5854691403° = 135°35'5″ = 0.77551933733 rad
∠ C' = γ' = 78.46330409672° = 78°27'47″ = 1.77221542476 rad
Calculate another triangle
How did we calculate this triangle?
Now we know the lengths of all three sides of the triangle and the triangle is uniquely determined. Next we calculate another its characteristics - same procedure as calculation of the triangle from the known three sides SSS.
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

6. Inradius

7. Circumradius
