A cent is equal to one hundredth of an acre, or 435.6 square feet. Therefore, ten cents is equal to 10 x 435.6 = 4356 square feet.
A Mekko chart (sometimes also called marimekko chart) is a two-dimensional stacked chart. In addition to the varying segment heights of a regular stacked chart, a Mekko chart also has varying column widths. Column widths are scaled such that the total width matches the desired chart width.
Whether it's a kind of graph, a map, or even a piece of music, a chart is a visual display of information. As a verb, chart means to make that kind of display. Some words' meanings grow narrower over the centuries. But in the case of chart, which comes from the French charte and Latin charta, map, the meanings have grown a lot since the 1500s.