We need to see the rest of the question...
Look at the problem and do it in order
Answer:
how much wood do you need
The formula for finding the area of a cone is pi times the radius squared times the height/3. Since we already have the base area, all we need to do is find the height over 3. The height is 6, so 6/3=2. Then 4 pi times 2=8 pi.
The answer is 8pi.
Step-by-step explanation:
derivative of cos(x) is -sinx