# 11 23 26 triangle

### Obtuse scalene triangle.

Sides: a = 11   b = 23   c = 26

Area: T = 126.3332893579
Perimeter: p = 60
Semiperimeter: s = 30

Angle ∠ A = α = 24.99436641747° = 24°59'37″ = 0.4366221732 rad
Angle ∠ B = β = 62.06109868645° = 62°3'40″ = 1.08331685578 rad
Angle ∠ C = γ = 92.94553489607° = 92°56'43″ = 1.62222023638 rad

Height: ha = 22.97696170143
Height: hb = 10.98554690069
Height: hc = 9.71879148907

Median: ma = 23.92217474278
Median: mb = 16.31771688721
Median: mc = 12.49899959968

Inradius: r = 4.21110964526
Circumradius: R = 13.01771957074

Vertex coordinates: A[26; 0] B[0; 0] C[5.15438461538; 9.71879148907]
Centroid: CG[10.38546153846; 3.23993049636]
Coordinates of the circumscribed circle: U[13; -0.66988677636]
Coordinates of the inscribed circle: I[7; 4.21110964526]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 155.0066335825° = 155°23″ = 0.4366221732 rad
∠ B' = β' = 117.9399013135° = 117°56'20″ = 1.08331685578 rad
∠ C' = γ' = 87.05546510393° = 87°3'17″ = 1.62222023638 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.