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The adjacent sides of a parallelogram ABCD measure 34 cm and 20 cm, and the diagonal AC measures 42 cm. Find the area of the parallelogram.

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Given that adjacent sides of a parallelogram ABCD measure 34 cm and 20 cm, and the diagonal AC measures 42 cm. 

Area of parallelogram = Area of ∆ADC + area of ∆ABC 

[∵ Diagonal of a parallelogram divides into two congruent triangles]

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