Let us say the height of cardboard box is h feet
and the angle of elevation = "\\theta"
"\\tan\\theta" = "\\frac{Height\\thinspace of\\thinspace the\\thinspace tent }{Length\\thinspace of\\thinspace tent's\\thinspace shadow}" = "\\frac{Height\\thinspace of\\thinspace the\\thinspace box }{Length\\thinspace of\\thinspace box's\\thinspace shadow}"
"\\implies" "\\frac{6 }{9}" = "\\frac{h }{6}"
"9h" = "36"
So "h=4" feet
Answer: the height of the cardboard box is 4 feet.
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