Answer:
Option C [tex]207\ units^{2}[/tex]
Step-by-step explanation:
we know that
the surface area of a pyramid is equal to
[tex]SA=B+LA[/tex]
where
B is the area of the base
LA is the lateral area
The area of the base B is
[tex]B=9*9=81\ units^{2}[/tex]
The lateral area is equal to
[tex]LA=4*(1/2)(9*7)=126\ units^{2}[/tex]
the surface area is equal to
[tex]SA=81+126=207\ units^{2}[/tex]
