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Since I can't see either the illuminated area or the list of choices, my

chance of selecting the appropriate equation is looking rather dim.

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Q: Which equation can be used to find the horizontal length r of the illuminated area?
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What is the mathematical equation for area?

Length x Width = Area


What is the equation area equals length multiplied by width used for?

The answer is in the question "area = length multiplied by width" the equation tells you what the surface area of something (eg a football pitch) is.


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If you are trying to find the width of a rectangle with length and area then divide the area by the length. A=LxW. Simply divide both sides of the equation by the length and you'll have the width. W=A/L


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What equation shows the area of a triangle with a base length of 11 feet?

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