Answer :

Let the length of the sides be 7k and 5k.

(where k is some arbitrary constant)

Area of the trapezium is given by

= **×(sum of parallel sides)×(distance between them)**

=

⇒

⇒

∴ side 7k = 7 × 5 = 35 and,

side 5k = 5 × 5 = 25

∴ Length of parallel sides is 35cm and 25cm.

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