# 5 25 28 triangle

### Obtuse scalene triangle.

Sides: a = 5   b = 25   c = 28

Area: T = 52.76436238331
Perimeter: p = 58
Semiperimeter: s = 29

Angle ∠ A = α = 8.67105787468° = 8°40'14″ = 0.15113301472 rad
Angle ∠ B = β = 48.91876668595° = 48°55'4″ = 0.85437743491 rad
Angle ∠ C = γ = 122.4121754394° = 122°24'42″ = 2.13664881573 rad

Height: ha = 21.10554495332
Height: hb = 4.22110899066
Height: hc = 3.76988302738

Median: ma = 26.42444205234
Median: mb = 15.75659512566
Median: mc = 11.35878166916

Inradius: r = 1.81994353046
Circumradius: R = 16.58333947033

Vertex coordinates: A[28; 0] B[0; 0] C[3.28657142857; 3.76988302738]
Centroid: CG[10.42985714286; 1.25662767579]
Coordinates of the circumscribed circle: U[14; -8.8898699561]
Coordinates of the inscribed circle: I[4; 1.81994353046]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 171.3299421253° = 171°19'46″ = 0.15113301472 rad
∠ B' = β' = 131.082233314° = 131°4'56″ = 0.85437743491 rad
∠ C' = γ' = 57.58882456063° = 57°35'18″ = 2.13664881573 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.