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...

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...

FIFA is backing down from its ban on international soccer matches in Bolivia's capital of La Paz.FIFA president Sepp Blatter said Friday he was responding to a request from Bolivian President Evo Morales, who led a campaign to overturn a ban announced in May on...

Chugging past shaggy yaks and fluffy clouds that look low enough to lasso, the train from Beijing to Lhasa makes its final climb into nosebleed territory pulled by three locomotives instead of the usual one....