# 4 22 25 triangle

### Obtuse scalene triangle.

Sides: a = 4   b = 22   c = 25

Area: T = 30.97547881349
Perimeter: p = 51
Semiperimeter: s = 25.5

Angle ∠ A = α = 6.46772683912° = 6°28'2″ = 0.1132875127 rad
Angle ∠ B = β = 38.27993217379° = 38°16'46″ = 0.66881001998 rad
Angle ∠ C = γ = 135.2533409871° = 135°15'12″ = 2.36106173268 rad

Height: ha = 15.48773940674
Height: hb = 2.81658898304
Height: hc = 2.47879830508

Median: ma = 23.46327364133
Median: mb = 14.12444468918
Median: mc = 9.68224583655

Inradius: r = 1.21546975739
Circumradius: R = 17.75663764958

Vertex coordinates: A[25; 0] B[0; 0] C[3.14; 2.47879830508]
Centroid: CG[9.38; 0.82659943503]
Coordinates of the circumscribed circle: U[12.5; -12.61110628521]
Coordinates of the inscribed circle: I[3.5; 1.21546975739]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 173.5332731609° = 173°31'58″ = 0.1132875127 rad
∠ B' = β' = 141.7210678262° = 141°43'14″ = 0.66881001998 rad
∠ C' = γ' = 44.74765901291° = 44°44'48″ = 2.36106173268 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.