# 11 17 25 triangle

### Obtuse scalene triangle.

Sides: a = 11   b = 17   c = 25

Area: T = 76.50661272056
Perimeter: p = 53
Semiperimeter: s = 26.5

Angle ∠ A = α = 21.10219668232° = 21°6'7″ = 0.36882987997 rad
Angle ∠ B = β = 33.80877628245° = 33°48'28″ = 0.5990056774 rad
Angle ∠ C = γ = 125.0990270352° = 125°5'25″ = 2.18332370799 rad

Height: ha = 13.91102049465
Height: hb = 9.00107208477
Height: hc = 6.12204901764

Median: ma = 20.65879282601
Median: mb = 17.3422145196
Median: mc = 6.98221200219

Inradius: r = 2.88770236681
Circumradius: R = 15.27765542145

Vertex coordinates: A[25; 0] B[0; 0] C[9.14; 6.12204901764]
Centroid: CG[11.38; 2.04401633921]
Coordinates of the circumscribed circle: U[12.5; -8.78219763533]
Coordinates of the inscribed circle: I[9.5; 2.88770236681]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 158.8988033177° = 158°53'53″ = 0.36882987997 rad
∠ B' = β' = 146.1922237176° = 146°11'32″ = 0.5990056774 rad
∠ C' = γ' = 54.91097296477° = 54°54'35″ = 2.18332370799 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.