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 
Cooking changes the composition of carbohydrate to sucrose; this gives a natural sweetness to the food. This is the reason why starch-rich or carbo-loaded kinds of food are very enticing to the senses, because when they are cooked the food naturally releases these sweet aroma and taste that you cannot resist.
serves as a source of neural stem cells (NSCs) in the process of adult neurogenesis.
If only gloves are worn as PPE, it is safe to remove and discard them in thepatient room. When a gown or full PPE is worn, PPE should be removed at the doorway or in an anteroom.Respirators should always be removedoutside the patient room, after the door is closed.