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A gable roof with a slope of 9 inches per foot has a rake slope factor of 1.25. If the run is 10 feet and the eaves length is 30 feet. What is the roof area in sq feet. a 150 b 1500 c 300 or d 750

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    If the slope is 9 inches per foot (run), then the roof is 15" per foot run.
    I suppose rake factor is the ratio of roof length to rise, which works out to 1.25 in this case.

    The roof area (for one sloping face) is therefore
    (15"/9")*10'*30' long
    = 500 sq. ft.
    If the roof has another sloping face, then double the above.

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