C. 630 cm² / 630 cm²
ExplanationSince 28² + 45² = 53² the area is 1/2 × 28 × 45 = 630 cm².
28² + 45² = 53² इसलिए क्षेत्रफल = 1/2 × 28 × 45 = 630 cm²।
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