# 8 22 25 triangle

### Obtuse scalene triangle.

Sides: a = 8   b = 22   c = 25

Area: T = 85.8698722478
Perimeter: p = 55
Semiperimeter: s = 27.5

Angle ∠ A = α = 18.19548723388° = 18°11'42″ = 0.31875604293 rad
Angle ∠ B = β = 59.17695025682° = 59°10'10″ = 1.03327026366 rad
Angle ∠ C = γ = 102.6365625093° = 102°38'8″ = 1.79113295877 rad

Height: ha = 21.46771806195
Height: hb = 7.8066247498
Height: hc = 6.86994977982

Median: ma = 23.20656027717
Median: mb = 14.95499163877
Median: mc = 10.85112672071

Inradius: r = 3.12224989992
Circumradius: R = 12.81102523044

Vertex coordinates: A[25; 0] B[0; 0] C[4.1; 6.86994977982]
Centroid: CG[9.7; 2.29898325994]
Coordinates of the circumscribed circle: U[12.5; -2.80222426916]
Coordinates of the inscribed circle: I[5.5; 3.12224989992]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 161.8055127661° = 161°48'18″ = 0.31875604293 rad
∠ B' = β' = 120.8330497432° = 120°49'50″ = 1.03327026366 rad
∠ C' = γ' = 77.3644374907° = 77°21'52″ = 1.79113295877 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.