Two circles have their centres at A.
One has radius r, the other has radius R. Neither of these values
is known. The distance BC is fixed at 20 cm. You have to find the area of the
space between the two circles. Change the positions of the points A and
B. The areas of the circles themselves will change but the space between them
remains the same. Can you make one of the two circular areas zero?
Can
you explain any of this? |
The total area is
|
What is the area between the two circles?