IsItOver
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8. Mark is sitting in a chair, legs out in front of him resting on an ottoman. His knees are.....

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Nausicca202
His knees are flat in front of him or 180 degrees, i hope that answered your question   
Yep! If legs are in front of him, then his legs are straight in perpendicular direction, so his knees are making 180 degree of angle..

Hope it helped.