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What is the measure of an enclosed shape expressed in square units?

A shape is either two dimensions (area) or three dimensions (volume) so the basic units of measurements are square inches, board feet, square rods, acres, square meters, or ares, for two dimensions and cubic inches, cubic meters, gallons, liters, acre-feet or bushels for 3 dimensions.


Is a white board a more environmentally friendly alternative to a chalk board?

White boards are more environmentally friendly because chalk leads to airborn dust being breathed into the lungs. It also eliminates the need for the manufacturing and shipping of chalk.


Why white board invented?

The white board is more convenient than black boards / chalk boards in several ways. Black board or chalk board will not return to its original state without extensive cleaning of the chalk residue. White board when used with the correct pens will clean to a pure white with the appropriate chemicals. Chalk boards generate dust when using and cleaning. Cleaning the chalkboard erasers causes an inhalant irritant. It is messy. White boards do not generate dust and therefore are healthier and less messy. A white board can be edited with a paper towel, rag, dry eraser or even a finger. A white board is light weight, transportable and long lasting. It is economical and convenient.


How to you clean a blackboard?

Use a wet towel or sponge. put a few drops of detergent in the water. After the (slate0 board is dry, chalk it by rubbing the side of a stick of chalk all over it then erase it with a felt eraser.


What happens when you add water to chalk?

Nothing will happen when you add water to chalk, because chalk does not dissolve in water. However, if you are drawing with chalk, as the water evaporates, it will allow the chalk to spread and create more fun.