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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.
right angle is 90 degrees, one ninth of that is 90 divided by 9, which gives 10degrees
Yes.
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1 degree = 60 minutes 1 minute = 60 seconds In other words, degrees are traditionally divided into smaller units just the same way as hours.