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<B1 = <B2
<C3 = <C4
<A = 70°
<B = 60°
<A bersebrangan dengan <C3, maka nilai dari <C3 = <C4 = <A
a. <C3 +<C4
= 70° +70°
= 140°
b. <B2 = 1/2 dari <B
= 1/2 . 60°
= 30°
c. <D = <B1 Kenapa ?? Karena, <B1 dengan <D bersebrangan.
<D = <B1
= 1/2 . <B
= 1/2 . 60°
<D = 30°
Itu jawabannya.