# 7 26 28 triangle

### Obtuse scalene triangle.

Sides: a = 7   b = 26   c = 28

Area: T = 89.79766452603
Perimeter: p = 61
Semiperimeter: s = 30.5

Angle ∠ A = α = 14.2821970741° = 14°16'55″ = 0.24992674131 rad
Angle ∠ B = β = 66.3989922328° = 66°23'24″ = 1.15987227348 rad
Angle ∠ C = γ = 99.3288106931° = 99°19'41″ = 1.73436025057 rad

Height: ha = 25.65661843601
Height: hb = 6.90774342508
Height: hc = 6.414404609

Median: ma = 26.79108566492
Median: mb = 15.73221327226
Median: mc = 12.90334879006

Inradius: r = 2.94441523036
Circumradius: R = 14.18876124248

Vertex coordinates: A[28; 0] B[0; 0] C[2.80435714286; 6.414404609]
Centroid: CG[10.26878571429; 2.13880153633]
Coordinates of the circumscribed circle: U[14; -2.32996404754]
Coordinates of the inscribed circle: I[4.5; 2.94441523036]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 165.7188029259° = 165°43'5″ = 0.24992674131 rad
∠ B' = β' = 113.6110077672° = 113°36'36″ = 1.15987227348 rad
∠ C' = γ' = 80.6721893069° = 80°40'19″ = 1.73436025057 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.