The depth of a pond decreases at a rate of 2% per year. If the pond currently has a depth of 5 feet, in approximately how many years will the depth of the pond fall below 4 feet?

b is the correct answer

arc length = 6.63311 ft.

step-by-step explanation:

the formula the arc measure is:

arc length s=2πr(c)/360

where:

c   is the central angle of the arc in degrees

r   is the radius of the arc

π   is pi, approximately 3.142

using the above formula we get

s =

thus we find that arc length of an arc for a circle of radius 20 feet and central angle 19 degrees is

6.63311 feet

i think it will be 4feet long of what i comprehend