Sectors show percentages. Absolute value = % × total. Two pies with different totals: always compute absolute values before comparing. A largest slice is not a majority unless it exceeds 50%.
A pie chart shows how a whole is divided into parts. Each sector's arc length (and area) is proportional to its percentage of the total. The key rule: all sectors must sum to 100%.
Pie charts show percentages. Without the total, you can't determine how many units any sector represents.
If Year 1 pie = $100M total and Year 2 pie = $200M total, a 30% sector doubled in absolute size even if the percentage is the same.
The largest sector is not necessarily a majority. Check if the sector percentage exceeds 50%.
If the given slices sum to less than 100%, there's an "Other" or unlabeled category.
In 3D or tilted pie charts, sectors closer to the viewer appear larger than they are. Always use the labeled percentage.
A sector twice as large in area has twice the percentage — but confirm with numbers, not visual estimation.
You cannot compare absolute values across two pie charts unless you know both totals.
Sector share growing from 20% to 22% = +2 percentage points, or +10% relative change of the share.
If asked for "A or B", add their percentages. If asked for "A and B" (overlap), that requires Venn logic — not simple addition.
Sometimes sectors are unlabeled. Compute by subtraction: missing % = 100% − sum of labeled sectors.
A pie chart shows: A=35%, B=28%, C=22%, Others=15%. Total sample = 400. How many respondents are in category B?
Using the same pie chart, what is the ratio of A's share to C's share?
A pie chart shows that the top 3 companies hold 40%, 25%, and 20% of the market. The total market size is $500M. What is the combined revenue of the three smallest players (the remaining category)?
Year 1 pie: Company X holds 30% of a $200M market. Year 2 pie: Company X holds 25% of a $320M market. X's absolute revenue:
A pie chart has 4 labeled sectors: 40%, 30%, 20%, and an unlabeled sector. The unlabeled sector represents:
Two pie charts both show the same market. Year 1: Company A = 45% of a $400M market. Year 2: Company A = 45% of a $600M market. Company A's revenue:
A pie chart of expense categories shows: Salaries 45%, Rent 20%, Marketing 15%, Technology 12%, Other 8%. Which TWO categories together equal more than half the expenses?
A market researcher says: "Since Company B's sector is visually twice as large as Company D's sector in the pie chart, B has twice the revenue of D." This is:
A pie chart shows client industry breakdown: Tech 40%, Finance 30%, Healthcare 20%, Other 10%. If the firm has 250 clients, and 60% of Tech clients upgraded their package, how many Tech clients upgraded?
A "donut chart" (pie chart with a hole in the middle) shows the same data as a regular pie chart. Which statement is true?
You need the total to compute any absolute count or revenue. Percentages alone cannot answer "how many."
Unknown sector = 100% minus all known percentages.
Never compare percentages across pies unless you confirm the totals are equal.
The largest sector is not necessarily a majority. It needs to exceed 50% of the whole.