Art style: Comic Book.
The square is now shown with its sides labeled with a small, elegant letter 'a'. The text 'Perimeter Formula' is prominent. Below it, the formula 'P = 4 × a' and the example 'a = 5 cm → P = 20 cm' are displayed in a clean, mathematical font. The background is uncluttered.
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FINAL STYLE ENFORCEMENT (this is the authoritative rendering directive — it overrides any style wording elsewhere in the prompt):
Render this image entirely in "Comic Book" style. Match the lighting grammar, material response, colour science, level of realism / stylisation, line weight, and shading model typical of "Comic Book". Keep the subject, composition, camera angle, lighting direction, and colour palette from the description above — but EVERY surface, skin, fabric, material, and environmental element must be rendered in the "Comic Book" idiom, not in any other medium.
