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 
No, it is toxic. You can hold people accountable without canceling them. Nowadays people will cancel anyone from anything.
Either a pedometer or a treadmill so the pedometer will track the activity levels which she can determine to do more or less. or the treadmill so she can walk to increase her activity levels