It would be 1/6a-1/6
You need to find the common denominator which is six
-2/3a+5/6a
-4/6a+5/6a=1/6a
C=2πr=π/2
2πr=π/2
4πr=π
r=π/4π=1/4
A=πr^2=(1/4)^2*π=1/16*π
The greates amount of pieces he would be able to use would be 9 because 8 divided by 5/6= 9 and 3/5.the 3/5 piece is too short.
