The altitude of a triangle is the perpendicular line which joins one vertex of a triangle to a point on the opposite side. (A line joining the vertex to an arbitrary point is called a cevian.) Each acute triangle has exactly three altitudes. The three...

In geometry, an altitude of a triangle is a straight line through a vertex and perpendicular to (i.e. forming a right angle with) the opposite side or an extension of the opposite side. The intersection between the (extended) side and the altitude is...

In summer, we watch the sky for those telltale signs of thunderstorms. We know that heat and haze will also affect our flight. These are obvious factors. Not so obvious, but even more insidious, is density altitude. Density altitude has an inevitable effect...

A prepared military needs places to practice its maneuvers, which are often loud and disruptive. To meet its readiness requirements, the military should find the best place to do this training with the least disruption on the ground. It is unclear that a proposal...

FIFA has banned international games from being played at high altitudes. FIFA president Sepp Blatter said the decision to ban games more than 8,200 feet above sea level was made Sunday after a review by the medical team for world soccer's governing body.Bolivia has held...

Early last week, a distressing, if not entirely unsurprising, Newsweek poll found that fully 40 percent of American adults continue to believe that Iraq was directly involved in the 9/11 attacks. It must, then, have been this exasperating chunk of the electorate that Joe Lieberman...