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急 ~~`中二數學問題(一條)~~要步驟~~求人回答~

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The figure shows triangleABC in which AB =3 , BC=7 .AB is produced to D such that angle BCD = 80度 and angleBDC=70度 Find a) the lengths of AC and BD , b) the area of triangle ACD

最佳解答:

Please read: 圖片參考:http://imgcld.yimg.com/8/n/HA00430218/o/20130811193029.jpg

其他解答:

中二應該未會sine rule 及cosine rule。
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