Penjelasan dengan langkah-langkah:
1. 60⁰+< CBD = 90⁰
<CBD = 30⁰
2. (3b+20)+64=180
3b =180- 84
b = 96/3=32
ABD =3b+20=3(32)+20= 116
3. sudut a dan c saling brtolak blakang mk <a=<c
<c=120⁰.
a+b=180⁰
120⁰+b=180⁰
b=180⁰-120⁰=60⁰
<b=<d=60⁰
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Penjelasan dengan langkah-langkah:
1. 60⁰+< CBD = 90⁰
<CBD = 30⁰
2. (3b+20)+64=180
3b =180- 84
b = 96/3=32
ABD =3b+20=3(32)+20= 116
3. sudut a dan c saling brtolak blakang mk <a=<c
<c=120⁰.
a+b=180⁰
120⁰+b=180⁰
b=180⁰-120⁰=60⁰
<b=<d=60⁰