R=21 center angle =120° find length of the arc and area of sector
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Corrosion is a natural process, which converts a refined metal to a more chemically stable form, such as its oxide, hydroxide, or sulphide. It is the gradual destruction of materials (usually metals) by chemical and/or electrochemical reaction with their environment. Corrosion degrades the useful properties of materials and structures including strength, appearance, and permeability to liquids and gases.
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Answer:
sorry I don't know
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Actually I was in 9 only sorry brother
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