According to Pythagoras theorem,
[tex] {H}^{2} = {P}^{2} + {B}^{2} \\ = > {H}^{2} = {(4ft)}^{2} + {(4ft)}^{2} \\ = > {H}^{2} = 32sq.ft \\ = > H = \sqrt{32}sq.ft \\ = > H = 4 \sqrt{2}sq.ft. \\ = > H = 5.7sq.ft = 6sq.ft(approx.)(after \: rounding \: to \: nerest \: tenth).[/tex]
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