# Sphere from tree points

Equation of sphere with three point (a,0,0), (0, a,0), (0,0, a) and center lies on plane x+y+z=a

**Correct result:****Showing 2 comments:**

**Math student**

how can you write r=a.(2/3)

is this applicable for all plane equation?

^{1}/2is this applicable for all plane equation?

**Dr Math**

We found some bugs in this problem, but I think now is OK solution:

(x+a)

(x+a)

^{2}+ (y+a)^{2}+(z-3a)^{2}= 6 a^{2}Tips to related online calculators

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Pythagorean theorem is the base for the right triangle calculator.

See also our trigonometric triangle calculator.

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