99 ! : if i have a circle with a radius of 6 in and it is cut into 8 equal slices (like a pie) and the coordinates are (8, 5) then what is the central angle, what is the measure of the arc that 2 pieces together would intercept, and the equation that represents and circumference? !

Part 1) 
coordinates of the center (8,5)
radius=6 in
is cut into 8 equal slices> 360°/8> 45° each slice
a) equation of a circumference
(x-h)²+(y-k)²=r²> (x-8)²+(y-5)²=6²

b) circumference=2*pi*r> 2*pi*6---> 37.68 in
if 360° (full circle) has a length of> 37.68 in
 90° (2 pieces together)> x
x=90*37.68/360> x=9.42 in

the measure of the arc that 2 pieces together would intercept is 9.42 in

c)  The central angle of one slice is 45 degrees

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