An exception to the width-to-height ratio for some letters. Which of the following letters can be as wide as they are high?

Question

BlackTom AI · Accepted Answer

Cap height and glyph advance width are the relevant typographic concepts. Cap height is the vertical measure of an uppercase letter; advance width (or glyph width) is the horizontal space the letter occupies. Most uppercase letters are proportioned so their advance width is less than cap height, but some letter shapes naturally span the full horizontal measure and so can be as wide as they are high.

Step-by-step reasoning:
1. Define the rule: width-to-height ratio here asks whether a letter’s horizontal extent (advance width) can equal its vertical extent (cap height).
2. Examine the geometry of candidate letters. Letters built from vertical and diagonal strokes that reach to both extreme left and right sides of their bounding box are able to occupy the full horizontal measure.
3. Uppercase M consists of two outer vertical strokes and two inner diagonals meeting at the center; the outer strokes are at the extreme left and right of the glyph, so the total width can equal the cap height without leaving side-bearing space.
4. Uppercase W is the mirrored counterpart: its outer strokes are also at the left and right extremes and the diagonals meet inward, so it too can occupy the full square bounding box.
5. Contrast with other letters: I is typically narrow (vertical stroke with side bearing), O is round and usually receives optical adjustments (it may be slightly narrower or wider to appear visually balanced), and X/H/R etc. generally have internal proportions that don’t require the full horizontal extent. Thus they are not standard examples of being as wide as high.

Why the correct answer is correct: The structural forms of M and W place stroke endpoints at the extreme sides of their glyph boxes, allowing their advance width to equal cap height. Other letters lack that geometric layout.

Conclusion: Both "M" and "W" can be as wide as they are high, which matches the provided correct answer: Both "M" and "W".

An exception to the width-to-height ratio for some letters. Which of the following letters can be as wide as they are high?单项选择题

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