ZW and DA are similar sides
WX and AB are similar sides.
Make a proprtion of the sides.
\(\sf{ \frac{WX}{AB} = \frac{ZW}{DA} }\)
Plug in the numbers
\(\sf{ \frac{6}{24} = \frac{ZW}{18} }\)
Cross multiply
\(\sf{ 6\times 18=ZW \times 24\)
And then solve for ZW
\(\sf{ZW = 4.5}\)
So our final answer is
\(\boxed{\bf{4.5~centimeters}}\)
Hope that helps :P
