the area of any parallelogram is equal to:
[tex]h\times b=A=7[/tex]
where h is the hight and b is the base
and the other condition is:
[tex]\frac{1}{4}b=h[/tex]
Now we have two equation and two variables, so we solve the system by replacin the second equation into the first equation.
[tex]\frac{1}{4}b\times b=7[/tex]
Now we solve the problem for b
[tex]\begin{gathered} b(\frac{1}{4}+1)=7 \\ b(\frac{1+4}{4})=7 \\ b\frac{5}{4}=7\text{ } \\ b=7\frac{4}{5} \\ b=5.6 \end{gathered}[/tex]
so the base is equal to 5.6
