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- Tom M. Apostol, Mamikon A. Mnatsakanian
- The American Mathematical Monthly
- 2009

1. INTRODUCTION. STANDARD TRAMMEL. Figure 1a shows a line segment of fixed length whose ends slide along two perpendicular axes. It can be realized physically as a sliding ladder or as a sliding door moving with its ends on two perpendicular tracks. During the motion, a fixed point on the segment traces an ellipse with one quarter of the ellipse in each… (More)

- Tom M. Apostol, Mamikon A. Mnatsakanian
- The American Mathematical Monthly
- 2004

1. INTRODUCTION. A spectacular landmark in the history of mathematics was the discovery by Archimedes (287-212 B.C.) that the volume of a solid sphere is two-thirds the volume of the smallest cylinder that surrounds it, and that the surface area of the sphere is also two-thirds the total surface area of the same cylinder. Archime-des was so excited by this… (More)

- Tom M. Apostol, Mamikon A. Mnatsakanian
- The American Mathematical Monthly
- 2003

1. INTRODUCTION. Given a finite set of fixed points in 3-space, what is the lo-cus of a point moving in such a way that the sum of the squares of its distances from the fixed points is constant? The answer is both elegant and surprising: the locus is a sphere whose center is at the centroid of the fixed points (if we allow the empty set and a single point… (More)

- Tom M. Apostol, Mamikon A. Mnatsakanian
- The American Mathematical Monthly
- 2002

- Tom M. Apostol, Mamikon A. Mnatsakanian
- The American Mathematical Monthly
- 2010

- Tom M. Apostol, Mamikon A. Mnatsakanian
- The American Mathematical Monthly
- 2004

1. INTRODUCTION. Two incongruent solids with remarkable properties are shown in Figure 1. One is a slice of a solid hemispherical shell with inner radius r and outer radius R cut by a plane parallel to the equator and at distance h < r from the equator. The other is a cylindrical shell with the same radii and altitude h. The surface of each solid consists… (More)

- Tom M. Apostol, Mamikon A. Mnatsakanian
- The American Mathematical Monthly
- 2004

1. INTRODUCTION. The centroid of the boundary of an arbitrary triangle need not be at the same point as the centroid of its interior. But we have discovered that the two centroids are always collinear with the center of the inscribed circle, at distances in the ratio 3 : 2 from the center. We thought this charming fact must surely be known, but could find… (More)

- Tom M. Apostol, Mamikon A. Mnatsakanian
- The American Mathematical Monthly
- 2002

1. MAMIKON'S THEOREM. Areas and volumes of many classical regions can be determined by an intuitive geometric method that does not require integral calculus or even equations for the boundaries. The method and its many applications was first announced by Mamikon A. Mnatsakanian in [1], but this paper seems to have escaped notice, probably because it… (More)

- Tom M. Apostol, Mamikon A. Mnatsakanian
- The American Mathematical Monthly
- 2011

Classical dissections convert any planar polygonal region onto any other polygonal region having the same area. If two convex polygonal regions are isoparametric, that is, have equal areas and equal perimeters, our main result states that there is always a dissection, called a complete dissection, that converts not only the regions but also their boundaries… (More)

- Tom M. Apostol, Mamikon A. Mnatsakanian
- The American Mathematical Monthly
- 2007

1. INTRODUCTION. In his delightful book Mathematical Snapshots, Steinhaus [1] describes the simple, engaging construction illustrated in Figure 1. Wrap a piece of paper around a cylindrical candle, and cut it obliquely with a knife. The cross section is an ellipse, which becomes a sinusoidal curve when unwrapped.