Answer:

Step-by-step explanation:
(Given)
You have to equal out each side to fine the value of the variable.
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The answer would be 3x i believe
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It’s d, d is the right answer
Well , the diameter means a straight line passing from side to side through the center of a body or figure, especially a circle or sphere. The area means what the extent or measurement of a surface or piece of land. So area means inside so all you need to do is just to divide each side by knowing what 20/4 is and that = 5 meters