The formula of area of triangle is
[tex] Area,A = \frac{1}{2}bh [/tex]
where b is the base and h is the height .
First we need to convert the mixed fraction to improper fraction, and on doing so we will get
[tex] Area,A= 8 \frac{15}{16} = \frac{143}{16}
\\
Base, b = 5 \frac{1}{2} = \frac{11}{2} [/tex]
Substituting the values of A and b, we will get
[tex] 143/16=(1/2)(11/2)h
\\
143/16=(11/4)h
\\
13/4=h=> h = 3\frac{1}{4}feet [/tex]
