# 4 26 28 triangle

### Obtuse scalene triangle.

Sides: a = 4   b = 26   c = 28

Area: T = 46.63768952654
Perimeter: p = 58
Semiperimeter: s = 29

Angle ∠ A = α = 7.36111606635° = 7°21'40″ = 0.12884764903 rad
Angle ∠ B = β = 56.38876254015° = 56°23'15″ = 0.98441497206 rad
Angle ∠ C = γ = 116.2511213935° = 116°15'4″ = 2.02989664426 rad

Height: ha = 23.31884476327
Height: hb = 3.5877453482
Height: hc = 3.33112068047

Median: ma = 26.94443871706
Median: mb = 15.19986841536
Median: mc = 12.24774487139

Inradius: r = 1.60881688023
Circumradius: R = 15.61099585072

Vertex coordinates: A[28; 0] B[0; 0] C[2.21442857143; 3.33112068047]
Centroid: CG[10.07114285714; 1.11104022682]
Coordinates of the circumscribed circle: U[14; -6.90444047244]
Coordinates of the inscribed circle: I[3; 1.60881688023]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 172.6398839336° = 172°38'20″ = 0.12884764903 rad
∠ B' = β' = 123.6122374598° = 123°36'45″ = 0.98441497206 rad
∠ C' = γ' = 63.7498786065° = 63°44'56″ = 2.02989664426 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.