Moss's Egg

• Draw a semicircle on the base AC of the triangle, outside of the triangle.
• Connect it to a circular arc centered at C from A to a point D on line BC, and by another circular arc centered at A from C to a point E on line AB. When the apex angle at B is greater than 60°, these two points D and E will be outside the triangle, equidistant from B.
• Complete the oval by a circular arc centered at B, from D to E.