# i cant figure this out please help

Z=+-square root of r1 squared- x Squared- y squared

### Comments for i cant figure this out please help

 Jan 15, 2011 Equation of a Sphere by: Staff The question: Z=+-square root of r1 squared- x Squared- y squared The answer: Z=+-square root of r1 squared- x Squared- y squared Z=+-sqrt(r1^2 - x^2 - y^2) I’m going to put this equation into a form I think you will recognize: Z=+-sqrt(r1^2 - x^2 - y^2) Square each side of the equation (z)^2 = (+-sqrt(r1^2 - x^2 - y^2))^2 z^2 = r1^2 - x^2 - y^2 Add x^2 + y^2 to each side of the equation z^2 + x^2 + y^2 = r1^2 - x^2 - y^2 + x^2 + y^2 x^2 + y^2 + Z^2 = r1^2 - x^2 + x^2 - y^2 + y^2 x^2 + y^2 + z^2 = r1^2 + 0 + 0 x^2 + y^2 + z^2 = r1^2 x squared + y squared + z squared = r1 squared Do you recognize it now? It is the general equation for a sphere with a radius of r1. --------------------------------------------------------------------- This is the general equation for a circle with radius r1 x squared + y squared = r1 squared This is the general equation for a sphere with radius r1 x squared + y squared + z squared = r1 squared --------------------------------------------------------------------- Thanks for writing. Staff www.solving-math-problems.com

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