9 21 29 triangle
Obtuse scalene triangle.
Sides: a = 9 b = 21 c = 29Area: T = 50.69770166775
Perimeter: p = 59
Semiperimeter: s = 29.5
Angle ∠ A = α = 9.58439574325° = 9°35'2″ = 0.16772716126 rad
Angle ∠ B = β = 22.8660133051° = 22°51'36″ = 0.39989845892 rad
Angle ∠ C = γ = 147.5565909516° = 147°33'21″ = 2.57553364518 rad
Height: ha = 11.26660037061
Height: hb = 4.82882873026
Height: hc = 3.49663459778
Median: ma = 24.91548550066
Median: mb = 18.72883208003
Median: mc = 7.12439034244
Inradius: r = 1.71985429382
Circumradius: R = 27.0288217631
Vertex coordinates: A[29; 0] B[0; 0] C[8.29331034483; 3.49663459778]
Centroid: CG[12.43110344828; 1.16554486593]
Coordinates of the circumscribed circle: U[14.5; -22.81095275774]
Coordinates of the inscribed circle: I[8.5; 1.71985429382]
Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 170.4166042567° = 170°24'58″ = 0.16772716126 rad
∠ B' = β' = 157.1439866949° = 157°8'24″ = 0.39989845892 rad
∠ C' = γ' = 32.44440904835° = 32°26'39″ = 2.57553364518 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
