A 7.5 quadrangle map is one of the standard topographic maps produced by the USGS. One degree is divided into 60 minutes. A 7.5 quad is 7.5 minutes of longitude wide and 7.5 minutes of latitude high. The scale is 1 to 24,000 meaning 1 inch on the map is 24,000 inches (2,000 feet) on the actual ground. Topographic maps show natural and cultural features. Contour lines, which are actually curves, indicate elevation.
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An invisible quadrangle!
No, but a quadrangle is the same as a quadrilateral.
A square is both a quadrangle and a parallelogram.
In New York there is a quadrangle which is surrounded by sky scrapers
No, a quadrangle has four angles and four sides.