Area of Circles

1. How many circles of radius $$=2$$ ft. would fit in your patio in the shape of a rectangle, parallelogram, triangle, or trapezoid?   Draw a diagram.
2. If the rectangle is $$12$$ft by $$15$$ft, how much area is not covered by the circles?
3. Two concentric circles have radii 3″ and 2″ respectively.  See below

Find the area of the ring.

1. Find the length of an arc whose central angle is 45˚ and whose radius is 3.

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