why might you need to measure a perimeter with a measuring tape insteadof a ruler.
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A ruler usually measures 1 foot, but can also be 2, 3, 4 or 6 feet. I have all of those . A yardstick only measures exactly 3 feet. A Tape measure comes in many lengths from 3 to 500 feet. I have 8 tapes, all of different lengths.
A broken ruler still has lines of measurement on it - it's just not as convenient as it was when it was whole. You measure the same way, by holding the ruler next to the item you're measuring and deciding which line it reaches to. With a broken ruler, you will probably have to measure one part at a time and add the measurements together.
yes a metric ruler and a meter ruler is the same
You need different tools these measurements. For mass you want a scale or balance. You can only use the same tool for length and volume (a ruler, caliper or similar) if the object you are measuring is a well defined solid with known geometric shape. Otherwise you will have to perform a measuring experiment for example put the object you want to determine the volume of in a graduated cylinder, pour a known volume of liquid into the cylinder, read the volume and subtract to determine the object's volume.
No. Measuring is getting an exact length. Estimating is guessing what the length is