# 4 25 26 triangle

### Obtuse scalene triangle.

Sides: a = 4   b = 25   c = 26

Area: T = 49.22884216688
Perimeter: p = 55
Semiperimeter: s = 27.5

Angle ∠ A = α = 8.71222446146° = 8°42'44″ = 0.15220573538 rad
Angle ∠ B = β = 71.20990972776° = 71°12'33″ = 1.24328332049 rad
Angle ∠ C = γ = 100.0798658108° = 100°4'43″ = 1.7476702095 rad

Height: ha = 24.61442108344
Height: hb = 3.93882737335
Height: hc = 3.78768016668

Median: ma = 25.42663642702
Median: mb = 13.7754977314
Median: mc = 12.30985336251

Inradius: r = 1.79901244243
Circumradius: R = 13.20437546191

Vertex coordinates: A[26; 0] B[0; 0] C[1.28884615385; 3.78768016668]
Centroid: CG[9.09661538462; 1.26222672223]
Coordinates of the circumscribed circle: U[13; -2.31106570583]
Coordinates of the inscribed circle: I[2.5; 1.79901244243]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 171.2887755385° = 171°17'16″ = 0.15220573538 rad
∠ B' = β' = 108.7910902722° = 108°47'27″ = 1.24328332049 rad
∠ C' = γ' = 79.92113418922° = 79°55'17″ = 1.7476702095 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.