# Isosceles triangle calculator (b)

Please enter two properties of the isosceles triangle

Use symbols: a, b, h, T, p, A, B, C, r, R

You have entered side b and angle γ.

### Acute isosceles triangle.

Sides: a = 9.35880020351   b = 9.35880020351   c = 3.25

Area: T = 14.97657285549
Perimeter: p = 21.96660040702
Semiperimeter: s = 10.98330020351

Angle ∠ A = α = 80° = 1.39662634016 rad
Angle ∠ B = β = 80° = 1.39662634016 rad
Angle ∠ C = γ = 20° = 0.34990658504 rad

Height: ha = 3.20106251973
Height: hb = 3.20106251973
Height: hc = 9.21658329569

Median: ma = 5.2132897517
Median: mb = 5.2132897517
Median: mc = 9.21658329569

Vertex coordinates: A[3.25; 0] B[0; 0] C[1.625; 9.21658329569]
Centroid: CG[1.625; 3.0721944319]
Coordinates of the circumscribed circle: U[1.625; 4.46546508066]
Coordinates of the inscribed circle: I[1.625; 1.36435369007]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 100° = 1.39662634016 rad
∠ B' = β' = 100° = 1.39662634016 rad
∠ C' = γ' = 160° = 0.34990658504 rad

# How did we calculate this triangle?

Now we know the lengths of all three sides of the triangle and the triangle is uniquely determined. Next we calculate another its characteristics - same procedure as calculation of the triangle from the known three sides SSS.