The purpose of a Chalkboard Eraser is to wipe off, or "erase," anything that is written on a Chalkboard. Things are usually written on Chalkboards using Chalk, and an eraser lifts the layer of chalk of the chalkboard, leaving it free again.
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A rectangular prism is like a chalkboard eraser. A triangular prism is a pyramid. A pentagonal prism is a three dimensional home plate. None of them are the same.
what are the characteristics of a chalkboard
a 1 inch eraser
Oh, dude, who even uses meters anymore? But if you must know, the standard size of a chalkboard is usually around 1.2 meters in length. So, like, if you're planning to measure it for some reason, just grab a meter stick and get it over with.