Okay, here we have this:
Considering the provided figure and information, we are going to calculate the requested measure, so we obtain the following:
So to calculate the length of the base, we will solve in the formula for the area of the triangle, we have:
Triangle Area=(Base*height)/2
Triangle Area*2=Base*height
Base=(Triangle Area*2)/height
Let's replace:
![\begin{gathered} Base=(24.75cm^2\cdot2)\frac{\placeholder{⬚}}{5.5cm} \\ =(49.5cm^2)/(5.5cm) \\ =9cm \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/usy59h5ec93zqycmfxowonuuv6u005m2or.png)
Finally we obtain that the length of the base of triangle is 9 cm.