2006-II-36
Ans: B
According to the given figure, the crosses move down a
… Read According to the given figure, the crosses move down a
$\begin{array}{rcl
$\begin{array}{rc
$\begin{
Note that each faces of the tetrahedron are equilater
$\begin{array}{ll}
OB=OC & \t
In $\Delta OAB$,
$\begin{array}{ll}
OB = B
$\begin{array}{cl
$\begin{array}{|c|c|c
$\begin{array}{cl}
=