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Can you find the exact measurement of a cylinder?
What do you mean by "exact measurement"? Do you wish to determine the cylinder's height? Its diameter? Its surface area? Its volume?
What does V stand for when finding the area of a cylinder?
The letter V typically represents the volume of a cylinder, not the area. The letter A is commonly used to represent the surface area of a cylinder.
The water in the cylinder originally read 42 milliliters. What is the volume of the rock placed into the cylinder?
Without knowing the second measurement in millimeters, this can't be answered.
How do you find the width length and height of a cylinder if you aleady have your volume?
Impossible to answer. You'd need at least one other measurement.
Can you calculate the volume of an item without knowing the density?
It is quite simple if it is a regular shaped object like a cylinder or a cube. For example if you wanted calculate the volume of a cylinder you need to know the radius of the circular cross-section of the cylinder - this is the measurement from the centre of the circle, to the outer-edge and then multiply that by the height of the cylinder. For irregular shaped objects don't think there is a simple mathematical way if you don't know the density but you can always use water displacement to get a volume measurement. Just drop the object you want to know the volume off into a graduated cylinder partially filled with water - the amount the level rises will be roughly equal to the volume of the object you dropped in.
