Triangle
A triangle or trigon is a polygon consisting of three sides connected at three corners.
It is one of the basic shapes in geometry and the simplest of polygons. The corners, also called vertices, are zero-dimensional points while the sides connecting them, also called edges, are one-dimensional line segments. A triangle has three internal angles, each one bounded by a pair of adjacent sides; the sum of angles of a triangle always equals a straight angle. The triangle is a plane figure and its interior is a planar region. Sometimes an arbitrary edge is chosen to be the base, in which case the opposite vertex is called the apex; the shortest segment between the base and apex is the height. The area of a triangle equals one-half the product of height and base length.
Getting to Triangle
Triangle is between Dumfries, to the north and west, and Quantico, and the Quantico Marine Corps Base, to the south.
Worth seeing
Prince William Forest Park is to the west. The Potomac River is to the east.
Text adapted from Wikipedia and Wikivoyage, CC BY-SA 4.0. Photograph: Dietmar Rabich (see Commons), Wikimedia Commons.