# 14 15 28 triangle

### Obtuse scalene triangle.

Sides: a = 14   b = 15   c = 28

Area: T = 52.81551256744
Perimeter: p = 57
Semiperimeter: s = 28.5

Angle ∠ A = α = 14.56663276483° = 14°33'59″ = 0.25442303774 rad
Angle ∠ B = β = 15.63224293747° = 15°37'57″ = 0.27328373627 rad
Angle ∠ C = γ = 149.8011242977° = 149°48'4″ = 2.61545249135 rad

Height: ha = 7.54550179535
Height: hb = 7.04220167566
Height: hc = 3.77325089767

Median: ma = 21.34224459704
Median: mb = 20.82766655997
Median: mc = 3.80878865529

Inradius: r = 1.85331623044
Circumradius: R = 27.8332935759

Vertex coordinates: A[28; 0] B[0; 0] C[13.48221428571; 3.77325089767]
Centroid: CG[13.82773809524; 1.25875029922]
Coordinates of the circumscribed circle: U[14; -24.05656087632]
Coordinates of the inscribed circle: I[13.5; 1.85331623044]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 165.4343672352° = 165°26'1″ = 0.25442303774 rad
∠ B' = β' = 164.3687570625° = 164°22'3″ = 0.27328373627 rad
∠ C' = γ' = 30.1998757023° = 30°11'56″ = 2.61545249135 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.