Question

Please jwb pakai cara no 1 dan 2

Answer 1

1. <ACD = 2 x 20°
= 40°
<ACB = (180 - <ACD)/2
= (180 - 40)/2
= 140/2
= 70

2. <a = 180/3
= 60 (krn itu segitiga sama sisi besar ke3 sudutnya sama)

<b = <a (bertolak belakang)
<b = 60

<b + <c + <d = 180
60 + 80 + <d = 180
140 + <d = 180
<d = 180 - 140
<d = 40