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3/12. = AE/6+AE
3(6+AE)= 12 x AE
18+3AE = 12 AE
18 cm = 9 AE
AE = 2 cm
b. DE/BC = AS/AT
2/3 = AS/15
30cm = 3AS
AS = 10 cm
c. AB/AD = BC/DE
5/2 = BC/4
20cm = 2BC
BC = 10cm
d. AB/AD = BC/DE
6/2 = 9/DE
18 cm = 6DE
DE = 3cm