Landforms.
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By using an area's elevation, relief, and landforms.
The total surface area (TSA) is determined by the sum of areas of its 6 faces - TSA = 2 (lw + wh + hl)
Geometric configurations that do not conform to standardized shapes (squares, triangles, circles, etc.) can still have their areas determined. They can be calculated by dividing the given parcel into known shapes (and thus formulae) and then calculating the areas of each, and combining their values.
In the Florida Keys, areas that receive between 21 and 60 inches of precipitation are typically found on the larger islands, such as Key Largo and Islamorada. These regions experience a tropical climate, with rainfall distributed throughout the year, often peaking during the summer months. The more lush, inland areas tend to receive higher precipitation compared to the drier coastal zones. Overall, the precipitation levels can vary significantly depending on local topography and seasonal weather patterns.
It depends completely on the type of map and the scale of the map. Look several contour lines above and below the area of interest. Often, the elevation is printed on every 5th contour line. Divide the difference by the number of spaces between the two lines. Example, one contour line says "1000" and the next one with an elevation says "1500". If there are 4 lines in between these two, it is 100 ft per contour line. In some areas, you will need to follow a contour line around the map to track down the elevation of that line. Easier still, check the legend on the side or bottom of the map. The example showing the colors or symbols used may also tell the contour interval if it is consistent for the entire map.