# 1.3 1.3 0.6 triangle

### Acute isosceles triangle.

Sides: a = 1.3   b = 1.3   c = 0.6

Area: T = 0.37994733192
Perimeter: p = 3.2
Semiperimeter: s = 1.6

Angle ∠ A = α = 76.65876362029° = 76°39'28″ = 1.33879281485 rad
Angle ∠ B = β = 76.65876362029° = 76°39'28″ = 1.33879281485 rad
Angle ∠ C = γ = 26.68547275942° = 26°41'5″ = 0.46657363565 rad

Height: ha = 0.58438051065
Height: hb = 0.58438051065
Height: hc = 1.26549110641

Median: ma = 0.77662087348
Median: mb = 0.77662087348
Median: mc = 1.26549110641

Vertex coordinates: A[0.6; 0] B[0; 0] C[0.3; 1.26549110641]
Centroid: CG[0.3; 0.42216370214]
Coordinates of the circumscribed circle: U[0.3; 0.59768799084]
Coordinates of the inscribed circle: I[0.3; 0.23771708245]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 103.3422363797° = 103°20'32″ = 1.33879281485 rad
∠ B' = β' = 103.3422363797° = 103°20'32″ = 1.33879281485 rad
∠ C' = γ' = 153.3155272406° = 153°18'55″ = 0.46657363565 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    