$B!ZNcBj(J5-1$B2rEz![(J
(2) 1.2 m$B!_(J36 N$B!_(Jsin 30$B!k(J=22 N(I%(Jm
(3) 1.2 m$B!_(J36 N$B!_(Jsin 135$B!k(J=31 N(I%(Jm
$B!!(J