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 
Acute hypothermia is caused by prolonged exposure to a cold environment. Hypothermia results when the internal body temperature drops below normal limits.
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The shortstop positions himself between the third baseman and the second-base bag. The shortstop is considered the captain of the infield and takes charge on balls hit in the air as well as communication among infielders.
Each choice has outcomes that influence the individual creation the choice just as others included. These outcomes can be prompt or dependable. The outcomes of choices can be certain, negative, or a blend of both.