Паралелограми (8 клас)

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  • . = 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.

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  • .) a = 8; ) a = 2;) a = 8,5;) a = 3;) a = 5) =64; = 32.) =4; = 8.) =72,25 ; = 34.) = 9 ; = 12.) =25 ; = 20. D

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  • 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 )

    3. :1 = 2; 3 = 4; 3 - 2 = 20 ; . ( 2 )

    4. :1 = 2; 3 = 4; D = 20 , = 10 , D + = 34 . D. (3 )

  • 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.

  • 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)

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  • D123 1. : = . 1. (. 1)

    2. = , 1 + D = 225, D = 10 . + . (. 1)

    3. : = 3 , = 7, 3 = 2. D. (. 1) 4. : D 18 . + D = 22 . .

    5. : CD 49 , D 62 . .

    5. : CD 30 , + D = 40 . D.

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  • D1 1. D 40 , D + = 28 . .

    2. 36 . D + C = 42 . D.

    3. D 14 , D 20 . D.

    4. D D 1. D.

    5. D 28. D.

    6. D 6 . + D.

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