IN a parellelogram ABCD, AB = 2BC. If the length of the altitude corresponding to AB is 10cm, what is the length of the altitude corresponding to BC?

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 in a parellelogram 

AB X 10 =  BC X DE (ALTITUDE CORRESPONDING TO BC)

AB/BC X 10 = DE

[AB/BC = 2 (AB = 2BC)]

2 X10 = DE = 20