Паралелограми (8 клас)

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<ul><li><p>. . . . . . .' . . . . . ..</p></li><li><p>: ; ; , . , ; . , , , , , .</p></li><li><p> ? 1. , , .2. . 3. .</p></li><li><p>1. ?2. ; ; ?3. .4. .5. .6. ?7. .8. .9. .</p></li><li><p>D D - , , . .</p><p> .</p><p> , 180</p><p> .</p><p> .'! </p></li><li><p>, </p><p>, , , , </p></li><li><p>) , ,) , ,) , . 1. , :) = 30, = 150, = 30; ) = 70, = 110 , = 80 ?2. , , . D</p></li><li><p> , . , ... ... ... ... . , ... , ...</p></li><li><p>D . - , , , 90. , . . . . . . </p></li><li><p> . = 2 (a + b) b . S = abb , :) a = 8, b = 4; ) a = 2, b = 14;) a = 8,5, b = 4;) a = 3, b = 4;) a = 5, b = 4;) =32 ; = 24.) =28 ; = 32.) =34 ; = 25.) =12 ; = 14.) =20 ; = 18.</p></li><li><p> 1. , . : D. D ( = D), = D ( = D; = D). ( ).</p><p> 2. , .: D D . , , . ( ).D</p></li><li><p>D 3. . , 10 . ': , = D. = D, D . = - . = = 10 . = , = 2 = 210 = 20 (). = 2( + b) = 2 (10 + 20) = 60 ().: 60 . 4. () , 6 10 . . </p><p>: 12 ; 20 .</p></li><li><p> . - , . .D , . . 1. . 2. (DCA = BCA, ABD = CBD). 3. , . 4. . 5. .D</p></li><li><p> . S = d1 d22. , . S = ah 3. . S = asin : ; , .D</p></li><li><p> .) a = 8; ) a = 2;) a = 8,5;) a = 3;) a = 5) =64; = 32.) =4; = 8.) =72,25 ; = 34.) = 9 ; = 12.) =25 ; = 20. D</p></li><li><p> 1. . D D. D D , D , D . , . . .</p><p> 2. . .. D ., . . = . . , , . , D . .DD</p></li><li><p>D D - , .</p><p> ? . ? ? ? , , ?7. ?</p></li><li><p> . </p><p> .</p><p> D</p></li><li><p> . .</p><p> .</p><p> .</p><p> . </p><p> .</p></li><li><p> a - , R - , r - . : P = 4a = 4(20,5)R2 = r2. S S = = 2R = 4r . aa</p></li><li><p> . . . . . . . . .</p></li><li><p> . : , :) ;) ;) , .</p><p> . . , , , .</p><p> . : ? .</p></li><li><p>1 +++2 -++3 +++4 ( 90)+-+5 , 180 +++6 +++7 -++8 +-+9 +++10 -++11 ()-++12 -++</p></li><li><p> '!</p></li><li><p> ...</p></li><li><p> 12345D: D . 1 = 2; 3 = 4. , 5 = 90 ':: + = 180, 2(4 + 1) = 180, 4 + 1 = 90,5 = 180 - (4 +1) = 180 - 90 = 90.: 90.2. :1 = 2; 3 = 4; 5 + 3 = 150 ; = 12 . . (1 )</p><p>3. :1 = 2; 3 = 4; 3 - 2 = 20 ; . ( 2 )</p><p>4. :1 = 2; 3 = 4; D = 20 , = 10 , D + = 34 . D. (3 )</p></li><li><p>D12' . 1. 1 = 2, = 3 . D. 2. 1 = 2, = 15 , D = 9 . D. 3. 1 = 2, D 52 . D 8 . D. 4. 1 = 2, D 20 . D = 3. D. 5. 1 = 2, D = + 2 , = 1 . D. 5. 1 = 2, = + 3 , D = . D 26 . D. </p></li><li><p>D . 1. D D 4 . . (. 1) 2 . 1 :3 = 7 : 2. 4. (. 2) . 1. D 64 . D + = 24 . . (. 1) 2. C : D = 2 : 1. , 1 = 2. (.2) 1324D . 3. : 1 = 57. 2. (.2) 4. , 1 + 3 = 90. (. 2) 5. 2 + 3 = 63. 1. (.2)</p><p>. 1. 2</p></li><li><p> D123 1. : = . 1. (. 1)</p><p> 2. = , 1 + D = 225, D = 10 . + . (. 1)</p><p> 3. : = 3 , = 7, 3 = 2. D. (. 1) 4. : D 18 . + D = 22 . .</p><p> 5. : CD 49 , D 62 . .</p><p> 5. : CD 30 , + D = 40 . D.</p><p>D</p></li><li><p>D1 1. D 40 , D + = 28 . .</p><p> 2. 36 . D + C = 42 . D.</p><p> 3. D 14 , D 20 . D.</p><p> 4. D D 1. D.</p><p> 5. D 28. D.</p><p> 6. D 6 . + D.</p><p> 7. , D + D = D.</p></li><li><p>:.. , .. , .. . // . . 1992.2. .. , . , .. . : 8 / : , 2008.3. .. , ,, , . : 7-9 / .:, 1993.4. . , . . //: -S, 1997. </p></li></ul>