please bhelp with math

Question

A machinist is required to manufacture a circular metal disk with area 2400 cm².

(a) What radius produces such a disk? (Round your answer to four decimal places.)

----------cm

(b) If the machinist is allowed an error tolerance of ±4 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.)--------cm m

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Answer 1

r^2pi=area=2400

r^2=763.943726..........

r=27.6395.............