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Which statement is geometrically false?

A. If $a // (\alpha)$ and $b \perp a$ then $b \perp (\alpha)$

B. If $a // b$ and $(\alpha) \perp a$ then $(\alpha) \perp b$

C ...

Let $n \geq 3$ and $V(n)$ be the volume of the largest $n$-gonal pyramid that is inscribed in a sphere of radius $R$.

If $\theta_{n}$ is the ...

If $x$ be an obtuse angle, $y$ be an acute angle, and $\sin x=2\sin (x+2y)$, then choose the correct option.

A circle of varying radius moves in such a way that during its course of motion it always touches the $x$-axis and also touches the fixed circle of radius ...

A cylindrical bucket of 32 cm high and with radius of base 18 cm, is filled with sand completely. This bucket is emptied on the ground and a conical heap ...

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