Tolong dong No 20-23 bsk dikumpulin

20. (2x+5) = 180
2x = 180-5
2x = 175
x = 175:2 = 87,5

21. penyiku = 90-35 = 55
pelurus = 180-55 = 125

nomor 20

90°= (2x+5)° + (3x-25)°
90°= 5x - 20°
90° + 20°= 5x
110° = 5x
x = 22°

ABD = 2x + 5°
ABD = 2×22° + 5°
ABD = 44° + 5°
ABD = 49°

Jawaban= A

nomor 21

sudut A = 35°

pelurus sudut A
=180°-35°
=145°

Jawaban= A

nomor 22

berpelurus artinya 180°

180° = (3x+12)° + (2x+8)°
180° = 5x + 20°
180° - 20° = 5x
160° = 5x
x = 32°

sudut B
= 2x + 8°
= 2×32° + 8°
= 64° + 8°
= 72°

Jawaban = B

*nomor 23 ga ada
*maaf kalau ada yang salah, nomor 21 agak ga yakin