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1) A wooden cylinder of length 21 cm has a diameter of 8 cm. what is the volume of the cylinder? ​

Answer»

Given, height of the CYLINDRICAL groove h = 21 cm Diameter of the LEAD = 3 cm So, RADIUS of the lead = 3/2 = 1.5 cm Now, volume of the lead = πr2 h                                    = (22/7) * (1.5)2 * 21                                    = 22 * 1.5 * 1.5 * 3                                    = 148.50 cm3 So, the volume of lead = volume of groove = 148.50   Again, given that groove is filled with lead. Now, outer diameter of the WOODEN CYLINDER = 12 cm So, outer radius of the wooden cylinder = 12/2 = 6 cm and height h = 21 cm Now, volume of wooden cylinder = πr2 h                                                = (22/7) * 62 * 21                                                = 22 * 36 * 3                                                = 2376 cm3 Now, volume of wood = volume of wooden cylinder without groove - volume of groove                                = 2376 - 148.50                                = 227.5 cm3 PLZ MARK ME  AS BRAINIEST



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