Mohon bantu ya kaa yg no 7

Besar sudut pelurus ABC = 180°
180° = p°+90°+p°
180° = 2p°+90°
180-90° = 2p°
90° = 2p
90/2° = p
45° = p

Sudut ABD = p + 90
Sudut ABD = 45 + 90°
Sudut ABD = 135
(C)

semoga membantu yah :D