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1). Take the information you have.

2). Collect and write down all the formulas, equations, and rules you know

that tell some kind of connection or relationship between the information

you have and the length of 'a' .

3). Use the information you have, and the relationship between that information

and the length of 'a', to find the length of 'a'.

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Q: How do you find missing length for a?
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