B. 210 cm² / 210 cm²
ExplanationSince 20² + 21² = 29² the area is 1/2 × 20 × 21 = 210 cm².
20² + 21² = 29² इसलिए क्षेत्रफल = 1/2 × 20 × 21 = 210 cm²।
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