Sure what do you need
Find the area of the annulus in the concentric circles (one with radius 4cm and the other with radius 11cm) shown below. Leave answer in pi form|dw:1439499583770:dw|
The formula for area of circle is, Area equals Pi times r times r
Try to figure out each of those circles now
true but what does annulus mean??
In greek it means little ring, you must find areas of both of those radius
so 16pi cm and 121pi cm?
So Pi times 4^2 and Pi 11^2