no 8 hasilnyaa adalahh?

Mapel : Matematika
Kelas : VIII SMP
Bab : Sudut

Pembahasan :
18||

< ABD + < DBC = 180°
3a + 20 + 2a = 180
5a + 20 = 180
5a = 160
a = 32

< ABD = 3a + 20
< ABD = 3(32) + 20
< ABD = 96 + 20
< ABD = 116°

Sudut ABD + sudut DBC = 180°
3a + 20 + 2a = 180
5a = 180 - 20
5a = 160
a = 160 /5
a = 32

Sudut ABD = 3a + 20
= 3(32) + 20
= 96 + 20
= 116°

Kalai boleh jadikan jawaban terbaik yah.