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A.180°B.220°C.240°D.300°

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18.109

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18X(6500+3500)=180000(TG).

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x—2x—2

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x—2x—2

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LA=LACB,

■:LA+LABC+LACB=180°,LABC=50°,

???2LA=130°,

LA=65°.

[WtJr]AAED=LCEF,=LACF,nl;

(2)?(l)^<tBA71=LACB,

25.W:(1W=DB,

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■??LD=LECB=30°,

???LDEC=120°,

???LCEB=90