Find the area of a rhombus whose perimeter is $140 c m$ and altitude is $2 c m$

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Solution

The perimeter is $4 \times s i d e = 140 c m$
therefore $s i d e = 35 c m$
The area of rhombus is $b a s e \times a l t i t u d e = 35 \times 2 = 70 c m^{2}$

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