Math, asked by ranjeetkumar7472121, 5 months ago

a black board is a ​

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Answered by dangerous82
0

A blackboard (also known as a chalkboard) is a reusable writing surface on which text or drawings are made with sticks of calcium sulfate or calcium carbonate, known, when used for this purpose, as chalk. Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone

Answered by pihu151204
1

Answer:

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