besar sudut ABC =… a. 102° b. 112° c. 122° d. 132° plis pake cara

Jawabannya b. 112
Cara :
6t+4+4t-4 = 180°
6t+4t = 180-4+4
10t = 180
t = 180/10
t = 18

<B = <D
6t+4 = (6×18)+4
= 108+4
= 112°
Terbaik ya ^_^

sudut ADC=ABC Dan DAB=DCB
(2 x 6t+4)+(2 x 4t-4)=360°
12t+8+8t-8=20t
360/20t=18

jadi sudut ABC
6t+4=(18×6)+4°=112°