tolong dijawab dgn benar ya bsk dikumpulkan nih, please

1. a. ad=8cm
cd=12 cm
b. abc=90°
cda=90°
c. ac dan db
d. bc
2. 2y-15 =57 -y
2y+y= 57+15
3y= 72
y = 72\3= 24
sdt K= 2y -15
=2.24-15
=48 - 15
=33°
sdt N= sdt K+ sdt N=180
=33° + N =180°
N = 180°-33=147°

ma af hanya itu yg bisa, smoga memebantu