# 22.24 18.8 3.87 triangle

### Obtuse scalene triangle.

Sides: a = 22.24   b = 18.8   c = 3.87

Area: T = 18.10992612072
Perimeter: p = 44.91
Semiperimeter: s = 22.455

Angle ∠ A = α = 150.1454912661° = 150°8'42″ = 2.62105230811 rad
Angle ∠ B = β = 24.88656711975° = 24°53'8″ = 0.4344336899 rad
Angle ∠ C = γ = 4.96994161417° = 4°58'10″ = 0.08767326736 rad

Height: ha = 1.62985306841
Height: hb = 1.92765171497
Height: hc = 9.35987913215

Median: ma = 7.7821648283
Median: mb = 12.90110561583
Median: mc = 20.50108432753

Inradius: r = 0.80664689916
Circumradius: R = 22.33879272833

Vertex coordinates: A[3.87; 0] B[0; 0] C[20.175; 9.35987913215]
Centroid: CG[8.015; 3.12195971072]
Coordinates of the circumscribed circle: U[1.935; 22.25439607781]
Coordinates of the inscribed circle: I[3.655; 0.80664689916]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 29.85550873391° = 29°51'18″ = 2.62105230811 rad
∠ B' = β' = 155.1144328803° = 155°6'52″ = 0.4344336899 rad
∠ C' = γ' = 175.0310583858° = 175°1'50″ = 0.08767326736 rad

# How did we calculate this triangle?

### 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    