# 38 38 53.74 triangle

### Right isosceles triangle.

Sides: a = 38   b = 38   c = 53.74

Area: T = 7221.999999993
Perimeter: p = 129.74
Semiperimeter: s = 64.87

Angle ∠ A = α = 455.0001230034° = 45° = 0.78554003102 rad
Angle ∠ B = β = 455.0001230034° = 45° = 0.78554003102 rad
Angle ∠ C = γ = 909.9997539932° = 89°59'59″ = 1.57107920332 rad

Height: ha = 387.9999999996
Height: hb = 387.9999999996
Height: hc = 26.87701153701

Median: ma = 42.4855218606
Median: mb = 42.4855218606
Median: mc = 26.87701153701

Inradius: r = 11.1329952212
Circumradius: R = 26.87700000002

Vertex coordinates: A[53.74; 0] B[0; 0] C[26.87; 26.87701153701]
Centroid: CG[26.87; 8.95767051234]
Coordinates of the circumscribed circle: U[26.87; 00.0001153698]
Coordinates of the inscribed circle: I[26.87; 11.1329952212]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 1354.999876997° = 135° = 0.78554003102 rad
∠ B' = β' = 1354.999876997° = 135° = 0.78554003102 rad
∠ C' = γ' = 900.0002460068° = 90°1″ = 1.57107920332 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    