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A square's side is measured as 10 cm with error 0.1 cm. The approximate error in its area is
A0.1 cm²
B0.2 cm²
C2 cm²
D1 cm²
Answer & Solution
Correct answer: C. 2 cm²
dA = 2x·dx = 2 × 10 × 0.1 = 2 cm².
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