Начертательная геометрия

%#$ 21.107-78. #-() ) -D, + .

< + , ', , ( -.

! ' , + ," , +D , D - ' – + . < + 15...20º - + .

-' D ', D' D .+ ' , ) "+ -+ .

14.7. "# " "/) sn% +& (, ' %$(, ( "&+%, &&( +%

' (

D , D', , " - , . . & , , .

@ + ' D D%#$ 21.103-78 C .

-D' ) + :

" -( .14.17, );

" " - " ( .14.17, );

D' -( .14.17, ).

= . 14.17

: , " ) D + %#$ 2.303-68 . = -" ) , . 7.1 ( . " . 7). # -" ) D %#$ = 21.1101-92 C .

@ " D - D . I " , D .

= . 14.19

( ( , " (

( D - , , - , D' "- ) " " " + ) , . , D , -D D ) --, " () ( . 14.20). ( - , , " D, , , -( – .

= . 14.20

( - . @ D + ( - , " ) " -. ! , ( , - " ( () ( ) ) . @ " ( , -" + , – -. ( " D - D' .

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C ' )) . ( ) D ( . 14.21, ) " D D - " . ' " ) ( . 14.21, )" ) "- . @ ' D D %#$ 21.103-78 D , ) .

) D D ) 8 ( . 14.21, ) %#$ 21.104-79. ) ( -D " () , ' . ; ( - D ) .

q D %#$ 21.104-79. ) D : " ) « .» – - D ( ; " ) «# » – ) ( -D' ; " ) «@ » – ( .

@ ) ' D , - D D', . : -, ,. 14.22-14.25.

C D' D D' + ) : 2,5; 3,5; 5; 7; 10; 14; 20; 28 40. @ -" " + ) , -" D : – - , + 1/4 1/8 . C -+ ) . =+ . "D 4/5 . $' 1/15...1/20 .