(c) Circle. Fine a similar formula for a circle in the plane through three given points. Find and sketch the circle through (2, 6), (6, 4), (7, 1).(d) Sphere. Find the analog of the formula in (c) for a sphere through four given points. Find the sphere through (0, 0, 5), (4, 0, 1), (0, 4, 1), (0, 0, ?? 3) by this formula or byinspection.

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(12) ax+by+1 = 0 1 = 0 ax₁ +by₁ c ax₂ + by₂ + c X₁ X₂ - 1 = 0 (Line L) (P₁ on L) (P₂ on L). yy1