Math
posted by A.W. .
30. Crafts. A circular coffee table has a diameter of 5 ft. What will it cost to have the
top refinished if the company charges $3 per square foot for the refinishing?

The top area is pi*(D^2/4)
Multiply that by $3 per sq ft
D^2 means Dsquared and equals 5x5
"pi" = 3.1416