Tolong kasih caranya yaa

6t+4+4t-4=180
10t=180
t=18

ABC=ADC=6t+4=6*18+4=108+4=112

Jawab :

[6t + 4] + [4t - 4] = 180
6t + 4t + 4 - 4 = 180
10t = 180
t = 18

Jadi,
ABC = ADC
ABC = [6t + 4]
        =  6.18° + 4°
        = 108° + 4°
        = 112° [B]

Semoga membantu ^_^