Question

Calculate ∠AOC, ∠BOD and ∠AOE in the adjoining figure,it is being given that ∠COD = 90°, ∠BOE = 72° and AOB is a straight line.​

Answer 1

Answer: The advantages of diagrammatic data presentation are: Diagrams are easy to understand. You can represent huge volumes of data in a simplified manner. They reveal hidden facts.

Answer 2

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Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color chage, formation of a precipitate, formation of a gas, odor change, temperature change.