No. 20 plz need help right now :(

luas alas=960:20=48
d1×d2=48×2=96
2:3=d1:d2

faktor 96=1,2,3,4,6,8,12,16,24,32,48,96
1:96≠2:3
2:48≠2:3
3:32≠2:3
4:24≠2:3
6:16≠2:3
8:12=2:3

yang sama hanyalah 8:12,jadi,
d2=12 cm(D)

semoga membantu