



 
Isvarya, The distance between two points (x, y, z) and (p, q, r) is the square root of
thus a point (x, y, z) is on the sphere with centre (1, 4, 3) and radius 5 if and only if the distance from (x, y, z) to (1, 4, 3) is 5^{2} = 25. Write this equation and simplify it to find the equation of the sphere. A point on the sphere is on the xz plane if its ycoordinate is zero. I hope this helps,  


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