18 28 29 triangle
Acute scalene triangle.
Sides: a = 18 b = 28 c = 29Area: T = 242.999884259
Perimeter: p = 75
Semiperimeter: s = 37.5
Angle ∠ A = α = 36.76439249588° = 36°45'50″ = 0.64216515365 rad
Angle ∠ B = β = 68.59659541323° = 68°35'45″ = 1.19772252532 rad
Angle ∠ C = γ = 74.64401209089° = 74°38'24″ = 1.30327158639 rad
Height: ha = 276.9998713989
Height: hb = 17.3577060185
Height: hc = 16.75985408683
Median: ma = 27.04662566726
Median: mb = 19.66596032513
Median: mc = 18.54404962177
Inradius: r = 6.48799691357
Circumradius: R = 15.03771086589
Vertex coordinates: A[29; 0] B[0; 0] C[6.56989655172; 16.75985408683]
Centroid: CG[11.85663218391; 5.58661802894]
Coordinates of the circumscribed circle: U[14.5; 3.98330436626]
Coordinates of the inscribed circle: I[9.5; 6.48799691357]
Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 143.2366075041° = 143°14'10″ = 0.64216515365 rad
∠ B' = β' = 111.4044045868° = 111°24'15″ = 1.19772252532 rad
∠ C' = γ' = 105.3659879091° = 105°21'36″ = 1.30327158639 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
