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11. 2trll "J^l 6F^l= E8:Lltrl. ?D ?l4lg +ol +g + 3 [cm], ZolE 30 [cm] 4EE +4^l a.J4ol 5 [cm]4s uj 4E+ -s.zN,t-1 d=4. (+) Eil { ^g -Zle+ B li 4gl^l= -+ =4. (+) de +el ==o'lE a;(l=4 ylg= ^Ioltr_ ,Jq -+=+. (+) + +"J trl "il = ++6};<1 9*-L, a a +E g ,Jq -+sH AlolETl g4E+ =CB g zlB zil =4 t4. (:zH 11 +4) 12. =^l EllolE 7J71= =8-L[tr|'. (,I) =dlq ql ol E = Ag z]\ ee E El ^l + ol= *iztlql _ H-Ur+. (+) Eil "lEE "l Ee TlAl= El d^l a qlols *+7ll= olF^l 7Jtr+. 13. ?=2113 e{loluql Ea1 E=tr|. eD +ol7l rrl _g= ,)g "-ll #zl EJEoil e +6] Bolrl #;<lgE+ ++. (:zH rz +4) (+) "J+el F 711= $"*i2il"il *x'l 9+E+ +trI. ('l) 4"lzl + = zl E ql ol _,o +l ql "J*Al I ^l +tr}. 14. trlzal HI"le+ == =.tr:Lltrl. ?t) +ol= a +q ;xl all, E. **7zI ql e +"lzl [_zB 13]r+ aol "Jq+_s= I "-lzl 916lq trlrzfl Elf (skid roll)E ++tr}. (,1) ElrlH HI+l= Exl € *"lzl **?z]]"I *9tg ql EB+ €"il^.] +A €qrl X"I 9l^l 6IE+ +q. (+) €s. Elrzfl u}+ls+ ?ol 6"lE il$6}Zl =f zl 617l +l6Iq ^L++trI. 15. E^l 4F= a{lHl= ^l8:-Lttrl. ?r) qltsl= s=+s.s zixlE tsEHzI zlFqr ral 11 2DH U^l 6lxl ral 12 +=)H r= 13 trlxal Hl+l ral 14 E^l += allHl trI 6 z) ,1.I ztlul -89-