# 17 17 25 triangle

### Obtuse isosceles triangle.

Sides: a = 17   b = 17   c = 25

Area: T = 144.0211482773
Perimeter: p = 59
Semiperimeter: s = 29.5

Angle ∠ A = α = 42.66879254941° = 42°40'5″ = 0.74546957849 rad
Angle ∠ B = β = 42.66879254941° = 42°40'5″ = 0.74546957849 rad
Angle ∠ C = γ = 94.66441490118° = 94°39'51″ = 1.65222010839 rad

Height: ha = 16.94437038556
Height: hb = 16.94437038556
Height: hc = 11.52217186218

Median: ma = 19.61550452459
Median: mb = 19.61550452459
Median: mc = 11.52217186218

Inradius: r = 4.88220841618
Circumradius: R = 12.54215317578

Vertex coordinates: A[25; 0] B[0; 0] C[12.5; 11.52217186218]
Centroid: CG[12.5; 3.84105728739]
Coordinates of the circumscribed circle: U[12.5; -1.0219813136]
Coordinates of the inscribed circle: I[12.5; 4.88220841618]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 137.3322074506° = 137°19'55″ = 0.74546957849 rad
∠ B' = β' = 137.3322074506° = 137°19'55″ = 0.74546957849 rad
∠ C' = γ' = 85.33658509882° = 85°20'9″ = 1.65222010839 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.