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Surface Areas and Volumes — Maths STD 9 — Question

Gujarat BoardEnglish MediumSTD 9MathsSurface Areas and Volumes1 Mark
MCQ
A cuboid is $12\ cm$ long, $9\ cm$ broad and $8\ cm$ high. Its total surface area is:
  • A
    $864\ cm^2$
  • ✓
    $552\ cm^2$
  • C
    $432\ cm^2$
  • D
    $276\ cm^2$
✓

Answer

Correct option: B.
$552\ cm^2$

Total surface area $= 2(lb × bh × lh)$
$= 2 [(12 × 9) + (9 × 8) + (12 × 8)]$
$= 2[108 + 72 + 96]$
$= 2 × 276$
$= 552\ cm^2$

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