※ 引述《mrjj123 (RRRRRRRR)》之銘言：
: https://i.imgur.com/hTsAX9N.jpg
: 請問這題要怎麼解呢
sinβ
----------------
sinα sinγ
2△ACD AB AC AD AE
= ---------------------------
AC AD 2△ABC 2△ADE
△ABE △ACD
= -----------------
△ABC △ADE
= (9 * 4) / (2 * 3)
= 6
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