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1 yd = 3 ft

area = ½ × (sum bases) × height

→ area = ½ × (5 ft + 3½ yd) × 7 ft

= ½ × (5 ft + (3½ × 3) ft) × 7 ft

= ½ × (5 + 10½ ft) × 7 ft

= 54¼ sq ft

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