C. 144 cm² / 144 cm²
ExplanationThe diagonal of a square is a√2. From a√2 = 12√2 we get a = 12 and area = 144 cm².
वर्ग का विकर्ण a√2 होता है। a√2 = 12√2 से a = 12 और क्षेत्रफल 144 cm²।
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