Discussion
Assertion: the slant height of a right cone equals its vertical height. Reason: both are measured from the apex.
Answer: D
Correct answer: the assertion is false although the reason offered is a true statement in itself
The reason is true - both the slant height and the vertical height are measured from the apex - but they are measured to different places, the slant height to a point on the base circle and the vertical height to the centre of the base. They are two sides of a right triangle, so the slant height always exceeds the vertical height and can never equal it.
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