perhatikan gambar beriku!!!!!!!!
10. <ABD = ( 5x + 42 )⁰, <DBC = 48⁰
Karena ini sudut berpelurus, maka jumlah dua sudut tersebut 180⁰
<ABD + <DBC = 180⁰
( 5x + 42 )⁰ + 48⁰ = 180⁰
5x + 90⁰ = 180⁰
5x = 180⁰ - 90⁰
5x = 90⁰
x = 18⁰
<ABD = ( 5x + 42 )⁰
= 5.18⁰ + 42⁰ = 90⁰ + 42⁰ = 132⁰
