A machinist is required to manufacture a circular metal disk with area 500 cm2.
(a) What radius produces such a disk? (Round your answer to four decimal places.)
12.6157cm
(b) If the machinist is allowed an error tolerance of ±7 cm2 in the area of the disk, how close to the ideal radius in part (a) must the machinist control the radius? (Round your answers to four decimal places.)
12.5270cm

Question

A machinist is required to manufacture a circular metal disk with area 500 cm2.
(a) What radius produces such a disk? (Round your answer to four decimal places.)
 12.6157cm
(b) If the machinist is allowed an error tolerance of ±7 cm2 in the area of the disk, how close to the ideal radius in part (a) must the machinist control the radius? (Round your answers to four decimal places.)
 12.5270cm<r<12.7037cm

What value of ε is given?
  cm2

What is the corresponding value of δ? (Round your answer to four decimal places.)
  cm