Please help! Will give a medal! Your help will be greatly appreciated!

Each sail on a windmill is 5 meters in length. How much area do the wings cover as they turn from the force of the wind?

***I know that the area for a circle formula is A=pi r squared, but I don't know what is a sail. Windmills have 4 things that make them turn, but is one of the 5 is it one long one?***

Question

Please help! Will give a medal! Your help will be greatly appreciated!

Each sail on a windmill is 5 meters in length. How much area do the wings cover as they turn from the force of the wind?


***I know that the area for a circle formula is A=pi r squared, but I don't know what is a sail. Windmills have 4 things that make them turn, but is one of the 5 is it one long one?***

anonymous · Answer

The problem is not as complicated as it seems. The sail on the windmill is like one "branch" on a spinning fan. What the problem is saying is that its length is 5 meters in length. What you should focus on is that the windmill spins in a circular motion and the sail remains constant in length. Thus, the area is simply pi * r * r, the area of a circle. Thus, 25 pi meters squared is the area that the sail covers when rotating.

lilai3 · Answer

thanks!