# 4 23 25 triangle

### Obtuse scalene triangle.

Sides: a = 4   b = 23   c = 25

Area: T = 41.42546303544
Perimeter: p = 52
Semiperimeter: s = 26

Angle ∠ A = α = 8.2844336002° = 8°17'4″ = 0.14545889396 rad
Angle ∠ B = β = 55.94442022574° = 55°56'39″ = 0.97664105268 rad
Angle ∠ C = γ = 115.7711461741° = 115°46'17″ = 2.02105931872 rad

Height: ha = 20.71223151772
Height: hb = 3.60221417699
Height: hc = 3.31439704284

Median: ma = 23.93774184072
Median: mb = 13.7220422734
Median: mc = 10.78219293264

Inradius: r = 1.59332550136
Circumradius: R = 13.88106308006

Vertex coordinates: A[25; 0] B[0; 0] C[2.24; 3.31439704284]
Centroid: CG[9.08; 1.10546568095]
Coordinates of the circumscribed circle: U[12.5; -6.03550568698]
Coordinates of the inscribed circle: I[3; 1.59332550136]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 171.7165663998° = 171°42'56″ = 0.14545889396 rad
∠ B' = β' = 124.0565797743° = 124°3'21″ = 0.97664105268 rad
∠ C' = γ' = 64.22985382594° = 64°13'43″ = 2.02105931872 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.