For a regular polygon, let r and R be th...

For a regular polygon, let `r` and `R` be the radii of the inscribed and the circumscribed circles. A false statement among the following is

There is a reagular polygon with `(r)/(R)=(1)/(2)`

There is a reagular polygon with `(r)/(R)=(1)/(sqrt(2))`

There is a reagular polygon with `(r)/(R)=(2)/(3)`

There is a reagular polygon with `(r)/(R)=(sqrt(3))/(2)`

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The false statement in the following is

`~p ^^ (~p)` is a contradiction

`(p to q) harr (q to p) is a contradiction

`~(~p) harr p` is a tautology

`p vv (~p)` is a tautology

`(SiH_3)_3N` is planar and less basic than `(CH_3)_3N`

`(SiH_3)_3N` is pyramidal and more basic than `(CH_3)_3`N

`(SiH_3)_3H` is pyramidal and less basic than `(CH_3)_3N`

`(SiH_3)_3N` is planar and more basic than `(CH_3)_3N`

`(a)/(4)cot((pi)/(2n))`

`acot((pi)/(n))`

`(a)/(2)cot((pi)/(2n))`

`acot((pi)/(2n))`