A lamp shade has a radius of 9 inches. What is the circumference of the top of the shade? Use 3.14 to approximate pi. Round your answer to the nearest whole number.

Question

anonymous · Answer

c = circumference
pi = 3.14
r = radius = 9 inches
d = diameter

c=pi*d

The radius is half of the diameter, d = 2r.  Then d = 2*9=18.

plug into equation.  c= pi*d = 3.14*18

round accordingly and you may want to include that the measurement you end up with is in inches.