[填空题]
Paper party cups in the shape ofphk0 vdea385n a cone a; -) za /qvrey7t4cbljre formed from a sector of paper material. The diagram below left shows the finished paper cup. The diagram below right shows the original paper sector used to create the cup. When the cones are formed, the straight edges of the sector join withoal-vzcb)74 ; q /ytejrut any overlap.
1.Find the slant height of the cups, L. cm
2.Find the arc length of the sector. cm
3.Find the angle $\theta$ in radians. radians