SOLUTION: two solid cylinder of radii 4 cm and 5 cm and length 6 cm and 4 cm respectively are recast in to cylindrical disk of thickness 1 cm. the radius of the disk ?

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Question 849818: two solid cylinder of radii 4 cm and 5 cm and length 6 cm and 4 cm respectively are recast in to cylindrical disk of thickness 1 cm. the radius of the disk ?
Answer by Fombitz(32388) About Me  (Show Source):
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The volume of a cylinder is V=pi%2AR%5E2%2AL
V%5B3%5D=V%5B1%5D%2BV%5B2%5D
pi%2AR%5E2%2A1=pi%2A4%5E2%2A6%2Bpi%2A5%5E2%2A4
R%5E2=96%2B100
R%5E2=196
R=14cm