Triangle calculator

Please enter what you know about the triangle:
You have entered side a, b and c.

Acute isosceles triangle.

Sides: a = 180   b = 180   c = 4.25

Area: T = 382.473334434
Perimeter: p = 364.25
Semiperimeter: s = 182.125

Angle ∠ A = α = 89.32435757789° = 89°19'25″ = 1.5598990497 rad
Angle ∠ B = β = 89.32435757789° = 89°19'25″ = 1.5598990497 rad
Angle ∠ C = γ = 1.35328484422° = 1°21'10″ = 0.02436116596 rad

Height: ha = 4.2549703826
Height: hb = 4.2549703826
Height: hc = 179.987745616

Median: ma = 90.05501596334
Median: mb = 90.05501596334
Median: mc = 179.987745616

Inradius: r = 2.11000595434
Circumradius: R = 90.0066272357

Vertex coordinates: A[4.25; 0] B[0; 0] C[2.125; 179.987745616]
Centroid: CG[2.125; 59.996581872]
Coordinates of the circumscribed circle: U[2.125; 89.98111838031]
Coordinates of the inscribed circle: I[2.125; 2.11000595434]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 90.67664242211° = 90°40'35″ = 1.5598990497 rad
∠ B' = β' = 90.67664242211° = 90°40'35″ = 1.5598990497 rad
∠ C' = γ' = 178.6477151558° = 178°38'50″ = 0.02436116596 rad

How did we calculate this triangle?

1. Input data entered: side a, b and c. 2. The triangle circumference is the sum of the lengths of its three sides 3. Semiperimeter of the triangle 4. The triangle area using Heron's formula 5. Calculate the heights of the triangle from its area. 6. Calculation of the inner angles of the triangle using a Law of Cosines     