B. 100 cm² / 100 cm²
ExplanationThe diagonal of a square is a√2. From a√2 = 10√2 we get a = 10 and area = 100 cm².
वर्ग का विकर्ण a√2 होता है। a√2 = 10√2 से a = 10 और क्षेत्रफल 100 cm²।
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