1/2*1/2=1/4. Think of it this way.
I cut the pizza in half, then I cut the half into another half. That's the same thing as 1/4.
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π × d = 2 × π × r
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3) Diameter = 19*2= 38
Circumference = 119.32
For the area, use the formula pi r^2
4+5=9, so 1800/9= 200. Each set is 200. There are 4 sets for the bagels, so that means the answer is 200*4=800.
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