17 26 28 triangle
Acute scalene triangle.
Sides: a = 17 b = 26 c = 28Area: T = 216.3187908413
Perimeter: p = 71
Semiperimeter: s = 35.5
Angle ∠ A = α = 36.46113196683° = 36°27'41″ = 0.63663700778 rad
Angle ∠ B = β = 65.35436112305° = 65°21'13″ = 1.1410635694 rad
Angle ∠ C = γ = 78.18550691012° = 78°11'6″ = 1.36545868817 rad
Height: ha = 25.44991656956
Height: hb = 16.64398391087
Height: hc = 15.45112791723
Median: ma = 25.64766372065
Median: mb = 19.17702895127
Median: mc = 16.92663108798
Inradius: r = 6.09334622088
Circumradius: R = 14.30330229106
Vertex coordinates: A[28; 0] B[0; 0] C[7.08992857143; 15.45112791723]
Centroid: CG[11.69664285714; 5.15504263908]
Coordinates of the circumscribed circle: U[14; 2.92985601208]
Coordinates of the inscribed circle: I[9.5; 6.09334622088]
Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 143.5398680332° = 143°32'19″ = 0.63663700778 rad
∠ B' = β' = 114.646638877° = 114°38'47″ = 1.1410635694 rad
∠ C' = γ' = 101.8154930899° = 101°48'54″ = 1.36545868817 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
