Cylindrical Co-ordinate Question

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SUMMARY

The discussion centers on the mathematical interpretation of the inequality -((4-x^2)^0.5) <= y <= ((4-x^2)^0.5) and its relation to the circular region defined by the equation x^2 + y^2 <= 4. The conclusion is drawn from the fact that the bounds on y represent the upper and lower halves of a circle with a radius of 2, centered at the origin. This relationship is established through the properties of inequalities and the geometric representation of circles in Cartesian coordinates.

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Homework Statement


In a textbook it states:

-((4-x^2)^0.5) <= y <= ((4-x^2)^0.5)

And this is the same as being bounded by the circular region x^2 + y^2 <= 4

How do they conclude this?

Thank you.

Homework Equations





The Attempt at a Solution

 
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ZedCar said:

Homework Statement


In a textbook it states:

How do they conclude this?

Thank you.

Homework Equations



The Attempt at a Solution

If |u| ≤ a, where a is positive, then -a ≤ u ≤ a .
 
Thanks SammyS
 

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