\f[pef[8^(ulQ_ Nȉh
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 hTlQ_eb_hT= ( + [)  2               C = 2 a + b 	
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 ckeb_hT=  4                       C = 4 a 
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 WvhT= WhTs v_                C = d         C   = 2 r 
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 JSWvhT= WhTv NJS+ v_        r + d 
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 bylQ_eb_by=  [                              S = a b 
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                     ckeb_by=                        S = a 2 
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                     s^LVb_by= ^ ؚ                      S = a h 
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                     	N҉b_by= ^ ؚ 2                         S = a h  2 
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                     hb_by= 
N^+ N^	 ؚ 2       S = ( a + b ) h  2 
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                     Wvby= WhTs JS_vs^e          S = r 2 
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                   WgvOby= ^bhT ؚ                S = C h 
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 hbylQ_eSOhby=  [+  ؚ+ [ ؚ	 2         
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                       S = ( a b + a h + b h )  2 
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 ckeSOhby=   6                   S = 6 a 2 
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 WgSOOby= ^bhT ؚ                    S = C   h 
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 WgSOhby= Oby+ ^by 2             S = S O+ 2   S ^
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 SOylQ_eSOSOy=  [ ؚ                      V = a b h 
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                     ckeSOSOy= h h h          V = a 3 
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                     WgSOSOy= ^by ؚ                      V = S h 
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 \я<OeSOs^>e_0RWgSOSOy= Obyv NJS JS_        V = C h  2  r = 2 r  2  r = r  r 	
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                     W%SOSOy= ^by ؚ 3                   V = S h  3 b1 / 3 S h 
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 sQ|_    Rpe^(u    USMO 1  vϑ Rs~vRs	= [^ϑ
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                                                 ]wϑ [^Rs~vRs	= USMO 1  vϑ
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                                                 kϑ USMO 1  vϑ= Rs~vRs	
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                     ]z        ]\OHes ]\Oe= ]\O;`ϑ
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                                                 ]\O;`ϑ ]\Oe= ]\OHes
 
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                                                 ]\O;`ϑ ]\OHes= ]\Oe
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                     vG        ^T vGe= z
 
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 z ^T= vGe
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 z vGe= ^T
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                     R_ N        US Nϑ peϑ= ;`ϑ
 
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                                                 ;`ϑ US Nϑ= peϑ
 
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                                               ;`ϑ peϑ= US Nϑ
 
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 kO:\          V
Nݍy[Eݍy= kO:\
 
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                                               V
Nݍy= [Eݍy kO:\
 
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                                               [Eݍy= V
Nݍy kO:\
 
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 s^GWpe          ;`pe ;`Npe= s^GWpe
 
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                                 y                                                   
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 ckkOsQ|_        = k    N[	            SkOx y = k  N[	
 
 