plis bantuin kerjain caranya nomor 1,2,3,4,5 tolong minta bantuannya ya

1.a sgtga abc sebanding dengan dbe
b.df=ab=20cm
2.a. sgtga abe dan dce bersebrangan
b. ab=cd=30cm
3.312,5 cm

no. 4
misal sisa bwh photo = x
samping photo/samping karton = atas photo/atas karton
(60 - 5 - x)/60 = (40 - 5 - 5)/40
55 - x = 60(30)/40
-x = 45 - 55
-x = -10
x = 10 cm

no. 5a)
CE/AE = CD/BD
CE/15 = 9/10
CE = 15(9)/10
CE = 13,5

DE = CE - CD
DE = 13,5 - 9 = 4,5

no. 5b)
BC/BD = AC/AE
BC/10 = (8 + BC)/15
15BC = 10(8 + BC)
15BC = 80 + 10BC
15BC -10BC = 80
5BC = 80
BC = 16