Discussion
Assertion: every plane section of a sphere is a circle. Reason: the sphere's surface is everywhere equidistant from its centre.
Answer: A
Correct answer: both the assertion and the reason are true and the reason explains the assertion
Both are true and the reason gives the mechanism. Every point of the surface lies at the radius from the centre, so the points lying in a given plane are all at a fixed distance from the foot of the perpendicular from the centre to that plane - which is the definition of a circle in that plane.
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