25. Besar penyiku sudut ABD adalah...

6x + 13 + 3x - 4 = 90
9x + 9 = 90
9x = 90 - 9
9x = 81
x = 9

6x + 13
= 9 × 6 + 13
= 54 + 13
= 67 °

Maaf Kalau Salah