The circumference of acircle is about 53.38cm. The radius of the circle is 8.5cm

To calculate the area of a circle we need to know it's radius.

The formula for the circumference of a circle is:

C

=

2

π

r

Substituting

53.38

cm

for

C

and solving for

r

gives:

53.38

cm

=

2

π

r

53.38

cm

2

π

=

2

π

r

2

π

26.69

π

cm

=

2

π

r

2

π

26.69

π

cm

=

r

r

=

26.69

π

cm

The formula for the area of a circle is;

A

=

π

r

2

Substituting the radius we solved for above and calculating

A

gives:

A

=

π

(

26.69

π

cm

)

2

#A = pi(712.3561/pi^2"cm"^2)#

#A = color(red)(cancel(color(black)(pi)))(712.3561/pi^color(red)(cancel(color(black)(2)))"cm"^2)#

#A = 712.3561/pi"cm"^2#

Substituting

3.14

for

π

allows us to approximate the area as:

#A = 712.3561/3.14"cm"^2#

A

=

226.865

cm

2

Step-by-step explanation:

18.75 gallons

step-by-step explanation: