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Discovering Geometry an Investigative Approach

Suppose the pizza slice in the photo at the beginning of this lesson is a sector with a $36^{\circ}$ arc, and the pizza has a radius of $20 \mathrm{ft}$. If one can of tomato sauce will cover $3 \mathrm{ft}^{2}$ of pizza, how many cans would you need to cover this slice?