# Equilateral triangle calculator

Please enter one property of the equilateral triangle

Use symbols: a, h, T, p, r, R

You have entered height h.

### Equilateral triangle.

Sides: a = 11.54770053838   b = 11.54770053838   c = 11.54770053838

Area: T = 57.7355026919
Perimeter: p = 34.64110161514
Semiperimeter: s = 17.32105080757

Angle ∠ A = α = 60° = 1.04771975512 rad
Angle ∠ B = β = 60° = 1.04771975512 rad
Angle ∠ C = γ = 60° = 1.04771975512 rad

Height: ha = 10
Height: hb = 10
Height: hc = 10

Median: ma = 10
Median: mb = 10
Median: mc = 10

Inradius: r = 3.33333333333
Circumradius: R = 6.66766666667

Vertex coordinates: A[11.54770053838; 0] B[0; 0] C[5.77435026919; 10]
Centroid: CG[5.77435026919; 3.33333333333]
Coordinates of the circumscribed circle: U[5.77435026919; 3.33333333333]
Coordinates of the inscribed circle: I[5.77435026919; 3.33333333333]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 120° = 1.04771975512 rad
∠ B' = β' = 120° = 1.04771975512 rad
∠ C' = γ' = 120° = 1.04771975512 rad

# How did we calculate this triangle?

### 3. From side a we calculate b,c:

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.

### 11. Calculation of medians

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See more informations about triangles or more information about solving triangles.