f.2 angle in rectilinear

(sum of ext.angle s of polygon.

(向右90度睇.

圖片參考:http://imgcld.yimg.com/8/n/HA00101881/o/7012052400...

2 個解答

評分
  • 9 年前
    最愛解答

    您好!我是 lop,高興能解答您的問題。

    ∠ADC + ∠HDE = 180° (adj. ∠s on st. line)

    ∠ADC = 180° - e

    ∠EAF + ∠DAB = 180° (adj. ∠s on st. line)

    ∠DAB = 180° - 80°

    ∠DAB = 100°

    ∠ABC + ∠ CBF = 180° (adj. ∠s on st. line)

    ∠ABC = 180° - 90°

    ∠ABC = 90°

    ∠GCD + ∠DCB = 180° (adj. ∠s on st. line)

    ∠DCB = 180° - 134°

    ∠DCB = 46°

    ∠DAB + ∠ABC + ∠DCB + ∠ADC = 360° (∠ sum of polygon)

    100° + 90° + 46° + 180° - e = 360°

    e = 56°

    2012-05-24 20:09:40 補充:

    = = I forgot to use ext. angles

    資料來源: 個人知識
  • 9 年前

    e + 80' + 90' +134' =360' (sum of ext. ∠s of polygon)

    e = 360' -90' -80' -134'

    = 56'

    FACT: sum of all exterior angles of a polygon = 360' )

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