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Pi x Radius x Radius = Area 3.1415 x 10 x 10 = 314.15 in^2 (for more accuracy, find more exact values of Pi)
If two variable, X and Y are in direct variation, then the proportion of X/Y or Y/X has a constant value.
It could be 60 x 10. It could be 30 x 20. It could be 40 x 15. Or it could be some funny shape like a circle or triangle.
Linear equations are used to find the value of missing numbers. They are also used to find the relation among the missing numbers. For example= x+3=4 x=4-3 x=1
113.0973355292328, but still, could you not find it out on your computer's calculator?