Answer:
A sphere has three, a circle has two, and a point has zero. What is it?
There is one in every corner and two in every room.
It can be used onstage or to express admiration. What is it?
Temporary evidence of where you've been strolling
Not my sister nor my brother but still the child of my mother and father. Who am I?
A leathery snake, with a stinging bite. I'll stay coiled up, unless I must fight.