SOLUTION
Given the question in the image, the following are the solution steps to answer the question.
STEP 1: Write the given measures
![\begin{gathered} Area=64m^2 \\ side=8m \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/h127gmwibm6blaue3td2idug5sxetazbrh.png)
STEP 2: Write the formula for area of a square
![\begin{gathered} Area=length* width \\ since\text{ length and width are equal, therefore,} \\ Area=length^2 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/9xhvtyx54d4q95wt74mzhe8qlkvz69cbha.png)
STEP 3: Find the missing length (t)
![\begin{gathered} Area=t*8 \\ 64m^2=8t \\ Divide\text{ both sides by 8} \\ t=(64m^2)/(8m)=8m \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/4weov4kyx3w2cmy3wzfbctrgfgqbmg4vp9.png)
Hence, the missing length is 8m