1-2-3 Magic in the Classroom: Effective Discipline for Pre-K Through Grade 8, 2nd Edition

1-2-3 Magic in the Classroom: Effective Discipline for Pre-K Through Grade 8, 2nd Edition

Matematika tolong bantuin yah....terima kasih​

tolong bantuin yah....terima kasih​

Penjelasan dengan langkah-langkah:

kurang lebih gitu kak, maaf ngga bisa jawab no 2 dan 3, takutnya malah salah(δΊΊ •͈α΄—•͈)

GARIS DAN SUDUT

1 )

[tex]2x+3x+20 = 180[/tex]     =====> Karena berpelurus

[tex]5x=180-20[/tex]             =====> Sederhanakan, dan pindah ruas

[tex]5x=160[/tex]

[tex]x=\frac{160}{5}[/tex]

[tex]x=32[/tex]

∠TQR = [tex]3x+20[/tex]

∠TQR = 3(32) + 20

∠TQR = 84°

2 )

∠DEA = ∠BEC     =====> Karena bertolak belakang

[tex]3x+20=5x+10\\3x-5x=10-20\\-2x=-10\\x=\frac{-10}{-2}\\x=5[/tex]

∠AEB = 180 - ∠DEA   ===> Karena berpelurus

∠AEB = 180 - (3x + 20 )

∠AEB = 180 - (3(5) + 20)

∠AEB = 180 - (15 + 20)

∠AEB = 145

∠AEB = ∠DEC   =====> Karena bertolak belakang

[tex]6y+25=145\\6y=145-25\\6y=120\\y=\frac{120}{6}\\y=20[/tex]

3 )

Saling sejajar =  xp dan wq

Berpotongan = vn dengan wq, vm dengan xp

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