# Isosceles triangle calculator (c)

Please enter two properties of the isosceles triangle

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

You have entered side c and angle γ.

### Acute isosceles triangle.

Sides: a = 5.35991000926   b = 5.35991000926   c = 6.3

Area: T = 13.65771496059
Perimeter: p = 17.01882001852
Semiperimeter: s = 8.50991000926

Angle ∠ A = α = 54° = 0.94224777961 rad
Angle ∠ B = β = 54° = 0.94224777961 rad
Angle ∠ C = γ = 72° = 1.25766370614 rad

Height: ha = 5.09768070646
Height: hb = 5.09768070646
Height: hc = 4.33656030495

Median: ma = 5.19985563814
Median: mb = 5.19985563814
Median: mc = 4.33656030495

Vertex coordinates: A[6.3; 0] B[0; 0] C[3.15; 4.33656030495]
Centroid: CG[3.15; 1.44552010165]
Coordinates of the circumscribed circle: U[3.15; 1.02334970431]
Coordinates of the inscribed circle: I[3.15; 1.60550051659]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 126° = 0.94224777961 rad
∠ B' = β' = 126° = 0.94224777961 rad
∠ C' = γ' = 108° = 1.25766370614 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.