Question

What is the surface area of a sphere with a circumference of 30 ft? Round the answer to the nearest tenth. 286.5 ft^2 143.2 ft^2 71.6 ft^2 22.8 ft^2

Answer 1

The answer is 71.6 ft^2.
It is given that 2πR=30 therefore R=4.77(aprox.)
Now you take the area formula:πR^2 which is equal to 71.6

Answer 2

Answer:

Surface area of a sphere= 286. 5 ft^2

Step-by-step explanation:

Find the surface area of a sphere with a circumference of 30 ft

Surface area of a sphere formula is $4\pi r^2$

Circumference of circle =$2\pi r$

$30=2\pi r$

divide both sides by 2*pi

so r= 30/2pi

Surface area of a sphere formula is  $4*\pi *(\frac{30}{2\pi})^2$

=286.4789

Now round to nearest tenth

Surface area of a sphere= 286. 5 ft^2