# 9 22 25 triangle

### Obtuse scalene triangle.

Sides: a = 9   b = 22   c = 25

Area: T = 97.85770385818
Perimeter: p = 56
Semiperimeter: s = 28

Angle ∠ A = α = 20.84551663601° = 20°50'43″ = 0.36438167861 rad
Angle ∠ B = β = 60.44400916213° = 60°26'24″ = 1.0554878599 rad
Angle ∠ C = γ = 98.71547420186° = 98°42'53″ = 1.72328972685 rad

Height: ha = 21.74660085737
Height: hb = 8.89660944165
Height: hc = 7.82985630865

Median: ma = 23.11438486627
Median: mb = 15.23215462117
Median: mc = 11.23661025271

Inradius: r = 3.49548942351
Circumradius: R = 12.64659988769

Vertex coordinates: A[25; 0] B[0; 0] C[4.44; 7.82985630865]
Centroid: CG[9.81333333333; 2.61095210288]
Coordinates of the circumscribed circle: U[12.5; -1.91660604359]
Coordinates of the inscribed circle: I[6; 3.49548942351]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 159.155483364° = 159°9'17″ = 0.36438167861 rad
∠ B' = β' = 119.5659908379° = 119°33'36″ = 1.0554878599 rad
∠ C' = γ' = 81.28552579814° = 81°17'7″ = 1.72328972685 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.