it has somethign to do with Washington DC
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An ellipse is a shape that is oval or egg-shaped, with two equal and opposite focal points. In the context of buildings, "flank" typically means to stand on either side of a particular area or structure. So, two buildings flanking an ellipse would mean that they are positioned on either side of the elliptical area.
The Ellipse (officially called President's Park South) is a 52-acre park located between the White House and the Washington Monument. Properly, the Ellipse is the name of the five-furlong circumference street within the park.
the White House and the Washington monument
An ellipse is a two dimensional shape, so it does not have a "surface area", only an "area". Any ellipse has two radii, the major one and the minor one. We'll call them R1 and R2. The area of the ellipse then can be calculated with the function: a = πR1R2 You will notice that this is the same equation as the area for a circle. The circle is a special case though, because it is an ellipse in which both axes are the same length. In that case, R1 equals R2, so we can simply call it r and say: a = πr2
An ellipse have two focal points.
No