# 9 23 26 triangle

### Obtuse scalene triangle.

Sides: a = 9   b = 23   c = 26

Area: T = 102.1766318196
Perimeter: p = 58
Semiperimeter: s = 29

Angle ∠ A = α = 19.98221160425° = 19°58'56″ = 0.34987537165 rad
Angle ∠ B = β = 60.84546345737° = 60°50'41″ = 1.06219392055 rad
Angle ∠ C = γ = 99.17332493838° = 99°10'24″ = 1.73108997316 rad

Height: ha = 22.70658484879
Height: hb = 8.88548972344
Height: hc = 7.86597167843

Median: ma = 24.1329857024
Median: mb = 15.69223548265
Median: mc = 11.66219037897

Inradius: r = 3.52333213171
Circumradius: R = 13.16884134226

Vertex coordinates: A[26; 0] B[0; 0] C[4.38546153846; 7.86597167843]
Centroid: CG[10.12882051282; 2.62199055948]
Coordinates of the circumscribed circle: U[13; -2.09993122848]
Coordinates of the inscribed circle: I[6; 3.52333213171]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 160.0187883958° = 160°1'4″ = 0.34987537165 rad
∠ B' = β' = 119.1555365426° = 119°9'19″ = 1.06219392055 rad
∠ C' = γ' = 80.82767506162° = 80°49'36″ = 1.73108997316 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.