In this short paper, we study two new equilateral triangles associated with an arbitrary triangle and further generalizations.
The Negative Pedal Curve (NPC) of the Ellipse with respect to a boundary point M is a 3-cusp closed-curve which is the affine image of the Steiner Deltoid. Over all M the family has invariant area and displays an array of interesting properties.
The testing of coiled oilfield tubing is considered to be an important requirement prior to and during offshore servicing. One interesting method is that of wall thickness measurement of ferromagnetic tubes using a noncontact direct current magnetic technique. This paper covers some results obtained with this for carbon steel coiled tubing.