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How do you read O on a graphic fractional scale?
Graphic and fractional scales are two different things. A graphic scale on a map is a line marked with the lengths which represent real distances. It has a zero at one end. A fractional scale simply gives the ratio between map and real distances, e.g. 1: 10 000, so zero doesn't come into it.
1inch equals 5miles and map b 1inch equals 2miles?
Simple, you're dealing with two diferently scaled maps. Topographic maps are drawn to scale. This means that distances on a map are proportional to distances on the ground. For example, if two cities 20 miles apart are shown 4 inches apart on a map, then any other locations that are 4 inches apart on the map are also 20 miles apart. This proportion, the map scale, is constant for the map so it holds for any points on the map. In this example the proportion between equivalent distances on the map and on the ground is expressed as a scale of 1 inch = 5 miles, that is 1 inch on the map is equal to 5 miles on the ground. The simplest form of map scale is a VERBAL SCALE. A verbal scale just states what distance on a map is equal to what distance on the ground, i.e. 1 inch = 5 miles from the example above. Though verbal scales are easy to understand, you usually will not find them printed on topographic maps. Other types of scale used are the fractional scale and the bar scale. In the case of your question, 1in = 5miles equates roughly to a fractional scale of 1:312,500 and 1in = 2miles equates roughly to a fractional scale of 1:125,000
What is a fractional portion?
A fractional portion is part of a whole portion
What is the fractional error formula?
What is the formula for percent fractional error? (Physics)
What are fractional lengths?
Well the fractional lengths is the length of a fraction
