<P> Though some presidents have chosen to do day - to - day work in a smaller study just west of the Oval Office, most use the actual Oval Office for work and meetings . Traffic from the large numbers of staff, visitors, and pets over time takes its toll . There have been four sets of flooring in the Oval Office . The original floor was made of cork installed over soft wood; however, President Dwight D. Eisenhower was an avid golfer and damaged the floor with his golf spikes . Johnson had the floor replaced in the mid-1960s with wood - grain linoleum . In 1982, President Ronald Reagan had the floor replaced with quarter sawn oak and walnut, in a cross parquet pattern similar in design to Eric Gugler's 1933 sketch, which had never been installed . In August 2005, the floor was replaced again under President George W. Bush, in exactly the same pattern as the Reagan floor . </P> <P> In the late 1980s, a comprehensive assessment of the entire house, including the Oval Office, was made as part of the National Park Service's Historic American Buildings Survey (HABS). Detailed photographs and measured drawings were made documenting the interior and exterior and showing even slight imperfections . A checklist of materials and methods was generated for future conservation and restoration . </P> <Table> <Tr> <Th> Dimensions </Th> <Th> US </Th> <Th> SI </Th> </Tr> <Tr> <Td> Major axis (north - south) </Td> <Td> 35 ft 10 in </Td> <Td> 10.9 m </Td> </Tr> <Tr> <Td> Minor axis (east - west) </Td> <Td> 29 ft </Td> <Td> 8.8 m </Td> </Tr> <Tr> <Td> Eccentricity </Td> <Td> 0.59 </Td> <Td> 0.59 </Td> </Tr> <Tr> <Td> Height </Td> <Td> 18 ft 6 in </Td> <Td> 5.6 m </Td> </Tr> <Tr> <Td> Line of rise (the point at which the ceiling starts to arch) </Td> <Td> 16 ft 7 in </Td> <Td> 5.0 m </Td> </Tr> <Tr> <Td> Approximate circumference </Td> <Td> 102 ft 5 in </Td> <Td> 31.2 m </Td> </Tr> <Tr> <Td> Approximate area </Td> <Td> 816.2 sq ft </Td> <Td> 75.8 sq m </Td> </Tr> </Table> <Tr> <Th> Dimensions </Th> <Th> US </Th> <Th> SI </Th> </Tr>

What is the size of the oval office
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