Answer:
168 cm2
Step-by-step explanation:
hello
the circumference is given by the formula
[tex]c=2*\pi *radius[/tex]
where
[tex]r=\frac{C}{2*3.1516} \\r=\frac{23}{2*3.1516} \\r=3.66 cm\\\\[/tex]
now with the radius of the balloon we can calculate the Surface area
[tex]s.a= 4\pi *r^{2} \\s.a= 4\pi *3.66^{2} \\s.a= 4\pi *13.39\\s.a.=4*3.1415*13.39\\[/tex]
S.A.=168 square centimeters approximately
Have a great day
