Triangle calculator SSS - result

Please enter the triangle sides:

Acute isosceles triangle.

Sides: a = 4   b = 8   c = 8

Area: T = 15.49219333848
Perimeter: p = 20
Semiperimeter: s = 10

Angle ∠ A = α = 28.95550243719° = 28°57'18″ = 0.50553605103 rad
Angle ∠ B = β = 75.52224878141° = 75°31'21″ = 1.31881160717 rad
Angle ∠ C = γ = 75.52224878141° = 75°31'21″ = 1.31881160717 rad

Height: ha = 7.74659666924
Height: hb = 3.87329833462
Height: hc = 3.87329833462

Median: ma = 7.74659666924
Median: mb = 4.89989794856
Median: mc = 4.89989794856

Inradius: r = 1.54991933385
Circumradius: R = 4.1311182236

Vertex coordinates: A[8; 0] B[0; 0] C[1; 3.87329833462]
Centroid: CG[3; 1.29109944487]
Coordinates of the circumscribed circle: U[4; 1.0332795559]
Coordinates of the inscribed circle: I[2; 1.54991933385]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 151.0454975628° = 151°2'42″ = 0.50553605103 rad
∠ B' = β' = 104.4787512186° = 104°28'39″ = 1.31881160717 rad
∠ C' = γ' = 104.4787512186° = 104°28'39″ = 1.31881160717 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    