[table][tr][td]1[/td][td]Construct two tangent circles, a third circle that runs through the centers of the first two and define the points I, K, L and M.[/td][/tr][tr][td]2[/td][td]Extend the edges of the square KLIM and define the points 1, 2, 3 en 4. [/td][/tr][tr][td]3[/td][td]Construct the circular arcs from 1 to 2 with center L and from 3 to 4 with center M.[/td][/tr][tr][td]4[/td][td]Drag the point K and change the dimensions of the oval.[/td][/tr][/table]