Asphere has a diameter of 12 ft. what is the surface area of the sphere? express the answer in terms of pi.
recall the formula sa=4 pi r^2.
pi ft^2

Step-by-step explanation:

We know that the diameter of the sphere is 12 feet.

By definition the radius of the sphere is:

Where d is the diameter of the sphere

Then

Now we calculate the surface area of the sphere using the formula

  or  

step-by-step explanation:

if the four friends split the cost, p, of the pizza evenly, then each friend pays one-fourth of the cost of the pizza.

the expression is   or  

what is the answer?