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The area of any triangle is the base times the height divided by 2. So a triangle having a base of 7 ft. and a height of 4 ft. has an area of 14 sq. ft. Since the windmill has 4 blades with such a shape, the total area is 4 times the area of each blade, which is 56 sq. ft.

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Q: What is the area of a windmill with 4 blades shaped like triangles with the base of 7 ft and a height of 4 ft?
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