Dependent Patient
Sit the patient fully upright or in an elevated side-lying position to prevent aspiration during mouth cleaning.
Inspect the patient's mouth: ...
Remove loose material or debris (especially important if patient is NPO/Nothing by Mouth): ...
Brush the teeth with toothpaste.
we know that
the surface area of the top of the water
is calculated with the formula of the area of a circle

Step 1
Find the radius of the water tank in the middle of the tank
by proportion

so
For h=5 m
the radius is equal to r=1.5 m
Step 2
Find the surface area


therefore
the answer is
the surface area of the top of the water is 
Bipolar disorder
not completely sure about this but IM TAKING A GUESS HERE