What is an area chart, and how is it different from a line chart?

• A. An area chart fills in the space under the line to create a visual area, representing the same data as a line chart
• B. It uses circular sectors to show parts of a whole
• C. It requires a horizontal axis in all cases
• D. It is a type of histogram

Answer: (A)

Area charts emphasize the magnitude of values by filling the space under the data line, using the same data as a line chart but with the area beneath the line shaded. This filled area makes it easy to see total volume or how large values become over time, while still showing the trend of the data points along the line.

A line chart, in contrast, shows just the line connecting data points, focusing on the path or trend without the filled area that highlights overall magnitude.

The other chart types described don’t fit: a circular-sector chart is a pie chart and illustrates parts of a whole; the statement about requiring a horizontal axis isn’t universal for all area charts; and a histogram is used to show distributions, not a time-series or magnitude across a baseline.