# 65 55 10.62 triangle

### Obtuse scalene triangle.

Sides: a = 65   b = 55   c = 10.62

Area: T = 106.8454945808
Perimeter: p = 130.62
Semiperimeter: s = 65.31

Angle ∠ A = α = 158.5440423524° = 158°32'26″ = 2.7677052388 rad
Angle ∠ B = β = 18.03327704912° = 18°1'58″ = 0.31547312183 rad
Angle ∠ C = γ = 3.42768059845° = 3°25'37″ = 0.06598090473 rad

Height: ha = 3.28875367941
Height: hb = 3.88552707567
Height: hc = 20.1211458721

Median: ma = 22.64216033001
Median: mb = 37.5855132699
Median: mc = 59.97333599192

Inradius: r = 1.63659660972
Circumradius: R = 88.83655076432

Vertex coordinates: A[10.62; 0] B[0; 0] C[61.80771751412; 20.1211458721]
Centroid: CG[24.14223917137; 6.7077152907]
Coordinates of the circumscribed circle: U[5.31; 88.67766672707]
Coordinates of the inscribed circle: I[10.31; 1.63659660972]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 21.46595764758° = 21°27'34″ = 2.7677052388 rad
∠ B' = β' = 161.9677229509° = 161°58'2″ = 0.31547312183 rad
∠ C' = γ' = 176.5733194015° = 176°34'23″ = 0.06598090473 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    