# 8 25 28 triangle

### Obtuse scalene triangle.

Sides: a = 8   b = 25   c = 28

Area: T = 97.13987538524
Perimeter: p = 61
Semiperimeter: s = 30.5

Angle ∠ A = α = 16.11333969958° = 16°6'48″ = 0.28112318313 rad
Angle ∠ B = β = 60.14875678299° = 60°8'51″ = 1.05497730957 rad
Angle ∠ C = γ = 103.7399035174° = 103°44'21″ = 1.81105877266 rad

Height: ha = 24.28546884631
Height: hb = 7.77111003082
Height: hc = 6.9388482418

Median: ma = 26.23992835268
Median: mb = 16.3633068172
Median: mc = 12.1866057607

Inradius: r = 3.18548771755
Circumradius: R = 14.4122373481

Vertex coordinates: A[28; 0] B[0; 0] C[3.98221428571; 6.9388482418]
Centroid: CG[10.66107142857; 2.31328274727]
Coordinates of the circumscribed circle: U[14; -3.42329387017]
Coordinates of the inscribed circle: I[5.5; 3.18548771755]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 163.8876603004° = 163°53'12″ = 0.28112318313 rad
∠ B' = β' = 119.852243217° = 119°51'9″ = 1.05497730957 rad
∠ C' = γ' = 76.26109648256° = 76°15'39″ = 1.81105877266 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.