# 8 18 23 triangle

### Obtuse scalene triangle.

Sides: a = 8   b = 18   c = 23

Area: T = 62.78108689013
Perimeter: p = 49
Semiperimeter: s = 24.5

Angle ∠ A = α = 17.65552689574° = 17°39'19″ = 0.30881425736 rad
Angle ∠ B = β = 43.03215320784° = 43°1'54″ = 0.75110419169 rad
Angle ∠ C = γ = 119.3133198964° = 119°18'48″ = 2.0822408163 rad

Height: ha = 15.69552172253
Height: hb = 6.97656521001
Height: hc = 5.45992059914

Median: ma = 20.26107995894
Median: mb = 14.68799182559
Median: mc = 7.85881168228

Inradius: r = 2.5622484445
Circumradius: R = 13.18987311293

Vertex coordinates: A[23; 0] B[0; 0] C[5.8487826087; 5.45992059914]
Centroid: CG[9.6165942029; 1.82197353305]
Coordinates of the circumscribed circle: U[11.5; -6.45769829487]
Coordinates of the inscribed circle: I[6.5; 2.5622484445]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 162.3454731043° = 162°20'41″ = 0.30881425736 rad
∠ B' = β' = 136.9688467922° = 136°58'6″ = 0.75110419169 rad
∠ C' = γ' = 60.68768010358° = 60°41'12″ = 2.0822408163 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.