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2.54 cm = 1 in

→ 21 cm × 14.5 cm = (21 ÷ 2.54) in × (14.5 ÷ 2.54) in

= 8 34/127 in × 5 90/127 in

≈ 8.27 in × 5.71 in

≈ 47.2 in²

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8y ago

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