| 1. |
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 |
|