# 8 22 28 triangle

### Obtuse scalene triangle.

Sides: a = 8   b = 22   c = 28

Area: T = 65.29216533716
Perimeter: p = 58
Semiperimeter: s = 29

Angle ∠ A = α = 12.23987557679° = 12°14'20″ = 0.21436065845 rad
Angle ∠ B = β = 35.65990876961° = 35°39'33″ = 0.62223684886 rad
Angle ∠ C = γ = 132.1022156536° = 132°6'8″ = 2.30656175805 rad

Height: ha = 16.32329133429
Height: hb = 5.9365604852
Height: hc = 4.66436895265

Median: ma = 24.86596057893
Median: mb = 17.40768951855
Median: mc = 8.83217608663

Inradius: r = 2.25114363232
Circumradius: R = 18.86991806131

Vertex coordinates: A[28; 0] B[0; 0] C[6.5; 4.66436895265]
Centroid: CG[11.5; 1.55545631755]
Coordinates of the circumscribed circle: U[14; -12.65109279111]
Coordinates of the inscribed circle: I[7; 2.25114363232]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 167.7611244232° = 167°45'40″ = 0.21436065845 rad
∠ B' = β' = 144.3410912304° = 144°20'27″ = 0.62223684886 rad
∠ C' = γ' = 47.89878434641° = 47°53'52″ = 2.30656175805 rad

# 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 ### 8. Calculation of medians #### Look also our friend's collection of math examples and problems:

See more informations about triangles or more information about solving triangles.