# 16 19 25 triangle

### Obtuse scalene triangle.

Sides: a = 16   b = 19   c = 25

Area: T = 151.9876841536
Perimeter: p = 60
Semiperimeter: s = 30

Angle ∠ A = α = 39.78876882825° = 39°47'16″ = 0.69444261623 rad
Angle ∠ B = β = 49.45883981265° = 49°27'30″ = 0.86332118901 rad
Angle ∠ C = γ = 90.7543913591° = 90°45'14″ = 1.58439546012 rad

Height: ha = 18.9988355192
Height: hb = 15.99986148985
Height: hc = 12.15989473229

Median: ma = 20.71223151772
Median: mb = 18.71549672722
Median: mc = 12.33989626793

Inradius: r = 5.06662280512
Circumradius: R = 12.50110822042

Vertex coordinates: A[25; 0] B[0; 0] C[10.4; 12.15989473229]
Centroid: CG[11.8; 4.0532982441]
Coordinates of the circumscribed circle: U[12.5; -0.16444879237]
Coordinates of the inscribed circle: I[11; 5.06662280512]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 140.2122311717° = 140°12'44″ = 0.69444261623 rad
∠ B' = β' = 130.5421601874° = 130°32'30″ = 0.86332118901 rad
∠ C' = γ' = 89.2466086409° = 89°14'46″ = 1.58439546012 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.