Pada gambar di atas diketahui garis EF // GH. Jika ∠FBC=(x+30)° dan ∠GCD= 2x°, maka ∠ABF ∶ ∠FBC adalah ....
a.
11 ∶ 7
b.
10 ∶ 8
c.
7 ∶ 11
d.
8 ∶ 10
a.
11 ∶ 7
b.
10 ∶ 8
c.
7 ∶ 11
d.
8 ∶ 10
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