Respuesta :

a) You have:
 Tan(45°)=y/18
 y=18 feet

 b= You have that:
 Tan(55°)=y/18
 y=25.70 feet

 c) Area of the garde=2(bh/2)

 Area 1 when theta=45°

 Area1=2(18x18/2)
 Area1=324 feet^2

 Area 2 when theta=55°

Area 2=2(25.70x18/2)
 Area2=462.6 feet2