Let us say the height of cardboard box is h feet
and the angle of elevation = θ\thetaθ
tanθ\tan\thetatanθ = Height of the tentLength of tent′s shadow\frac{Height\thinspace of\thinspace the\thinspace tent }{Length\thinspace of\thinspace tent's\thinspace shadow}Lengthoftent′sshadowHeightofthetent = Height of the boxLength of box′s shadow\frac{Height\thinspace of\thinspace the\thinspace box }{Length\thinspace of\thinspace box's\thinspace shadow}Lengthofbox′sshadowHeightofthebox
⟹ \implies⟹ 69\frac{6 }{9}96 = h6\frac{h }{6}6h
9h9h9h = 363636
So h=4h=4h=4 feet
Answer: the height of the cardboard box is 4 feet.
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