Question 982031: a metal washer 25mm in diameter is pierced by 12mm hole.what is the area of the face of washer at one side? Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! a metal washer 25mm in diameter is pierced by 12mm hole.what is the area of the face of washer at one side?
--------
You have a smaller circle inside a larger circle.
---
Area of larger circle = pi*12.5^2
---
Area of smaller circle = pi*6^2
------
Ans: larger area - smaller area = pi[12.5^2-6^2] = 120.25*pi mm^2
-----------------
Cheers,
Stan H.
-----------
(