99 POINTS!!!: 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?PLEASE HURRY!!!

• calculista: 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