# 3.6 2.7 1.8 triangle

### Obtuse scalene triangle.

Sides: a = 3.6   b = 2.7   c = 1.8

Area: T = 2.35328373828
Perimeter: p = 8.1
Semiperimeter: s = 4.05

Angle ∠ A = α = 104.4787512186° = 104°28'39″ = 1.82334765819 rad
Angle ∠ B = β = 46.56774634422° = 46°34'3″ = 0.81327555614 rad
Angle ∠ C = γ = 28.95550243719° = 28°57'18″ = 0.50553605103 rad

Height: ha = 1.30771318793
Height: hb = 1.74328425058
Height: hc = 2.61442637587

Median: ma = 1.42330249471
Median: mb = 2.50554939633
Median: mc = 3.05220484924

Inradius: r = 0.58109475019
Circumradius: R = 1.85990320062

Vertex coordinates: A[1.8; 0] B[0; 0] C[2.475; 2.61442637587]
Centroid: CG[1.425; 0.87114212529]
Coordinates of the circumscribed circle: U[0.9; 1.62766530054]
Coordinates of the inscribed circle: I[1.35; 0.58109475019]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 75.52224878141° = 75°31'21″ = 1.82334765819 rad
∠ B' = β' = 133.4332536558° = 133°25'57″ = 0.81327555614 rad
∠ C' = γ' = 151.0454975628° = 151°2'42″ = 0.50553605103 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    