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why asked in 科學及數學數學 · 1 decade ago

MATHS MC (CIRCLE) 一題

圖片參考:http://img182.imageshack.us/img182/2619/87nc7.jpg

可唔可以解釋下點 solve?

感激不盡 > <

Update:

re Gabriella Montez ~ mock exam in progress :

是87年的maths mc~

不過,,b和c沒有調轉~

問題也沒錯~

(根據我的ce pastpaper)

3 Answers

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  • 1 decade ago
    Favorite Answer

    請問閣下問的是否1987的題目?

    我查閱過該問題, 與上面的幾乎一樣, 只是圖上角b和角c的位置剛巧調亂了:

    圖片參考:http://i238.photobucket.com/albums/ff245/chocolate...

    Then by prop. of isos. △, we can find the other angle of the quad. as the sum of a and b.

    Next,

    360* - c = 2 ( a + b ) ( ∠ at centre twice ∠ at ⊙ )

    a + b = 180* - c / 2

    Hence the answer is E.

    2008-04-11 00:28:40 補充:

    由此證明, 你手上嘅paper印錯咗= =

    Source(s): My Maths Knowledge
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  • why
    Lv 5
    1 decade ago

    唔該晒~=]

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  • NCY
    Lv 7
    1 decade ago

    Gabriella Montez 說得沒錯,1987年的mc第45題中,你幅圖的b和c是調轉左...

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