Question 314888
1. Find the area of the whole pizza. 
a=(pi)(10^2), =314 

2. What is the area of one piece of pizza? 
(pi)(r^2)/16, 100(pi)/16=19.625 

3. What is the area of a half-piece? 
100(pi)/36=10 (9.8125 ans.)

4. What would the area of the whole pizza be if it were made of half pieces? 
a=10(pi), a=100/10, a=10 (9.8125 ans)
 
5. What is the radius of a half-piece? (ie, where do I need to cut to make two equal halves out of a piece?) 
What you have is an isosoeles triangl with 2 side=10 and the included angle=22,5.
Area=1/2x*x+sin 22.5
9.8125=x^2/2*.383
9.8125=x*2*.1915
x^2=9.8125/.1915
x^2=51.24
x=sqrt51.24
x=7.158 inches from the point is where the cut will half the piece.