CE : CB = DE : AB
5 : 25 = x : 20
X x 25 = 5 x 20
25x = 100
x = 100 : 25
x = 4
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DE/AB = EC/ BC
DE/20 = 5/25
25.DE = 20.5
25DE = 100
DE = 100/25
DE = 4
maka panjang DE adalah 4cm
CE : CB = DE : AB
5 : 25 = x : 20
X x 25 = 5 x 20
25x = 100
x = 100 : 25
x = 4