Question

I need help ASAP! Pease help me understand this please and thank you

Answer 1

Answer: the missing side lenght is: 75ft

Step-by-step explanation:

Phytagoras theorem: 21^2+72^2=x^2 / x is the missing side lenght

                                     $x=\sqrt[2]{21^{2} +72^{2} }$

                                      $x=75ft$