86°
Penjelasan dengan langkah-langkah:
<A1 = <A3 = 85° (< tolak belakang sama)
<B3 = <A3 = 85° (< sehadap sama)
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86°
Penjelasan dengan langkah-langkah:
<A1 = <A3 = 85° (< tolak belakang sama)
<B3 = <A3 = 85° (< sehadap sama)