How should we draw a circle on the equilateral triangle of given height ?

One height is given, then draw other two heights from other two vertices.
All these three heights will intersect at a point O in an equilateral triangle. This point O will be the centroid of the triangle.
Taking O as a centre and distance from O to any of the vertices of triangle as radius, draw  circle.
This circle passes through all three vertices of an equilateral triangle.