Jawaban:
1. <B1=<A1=130⁰ ... (sehadap)
2. <B2+<B1=180⁰ ... (berpelurus)
<B2+130⁰=180⁰
<B2=180⁰-130⁰
<B2=50⁰
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Jawaban:
1. <B1=<A1=130⁰ ... (sehadap)
2. <B2+<B1=180⁰ ... (berpelurus)
<B2+130⁰=180⁰
<B2=180⁰-130⁰
<B2=50⁰