# 9 17 25 triangle

### Obtuse scalene triangle.

Sides: a = 9   b = 17   c = 25

Area: T = 42.2876966077
Perimeter: p = 51
Semiperimeter: s = 25.5

Angle ∠ A = α = 11.47883409545° = 11°28'42″ = 0.22003348423 rad
Angle ∠ B = β = 22.07989688074° = 22°4'44″ = 0.38553507011 rad
Angle ∠ C = γ = 146.4432690238° = 146°26'34″ = 2.55659071101 rad

Height: ha = 9.39771035727
Height: hb = 4.97549371855
Height: hc = 3.38329572862

Median: ma = 20.8998564544
Median: mb = 16.75655960801
Median: mc = 5.36219026474

Inradius: r = 1.65883123952
Circumradius: R = 22.61333508433

Vertex coordinates: A[25; 0] B[0; 0] C[8.34; 3.38329572862]
Centroid: CG[11.11333333333; 1.12876524287]
Coordinates of the circumscribed circle: U[12.5; -18.84444590361]
Coordinates of the inscribed circle: I[8.5; 1.65883123952]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 168.5221659045° = 168°31'18″ = 0.22003348423 rad
∠ B' = β' = 157.9211031193° = 157°55'16″ = 0.38553507011 rad
∠ C' = γ' = 33.55773097619° = 33°33'26″ = 2.55659071101 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.