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Convert : 4 dm = 40 cm
The semiperimeter of the parallelogram is : 40 : 2 = 20 (cm)
Its length is : (20 + 10) : 2 = 15 (cm)
Its height is : \(15:\dfrac{3}{5}=25\) (cm)
Its area is : 15 x 25 = 375 (cm2)
Convert : 4 dm = 40 cm
The semiperimeter of the parallelogram is : 40 : 2 = 20 (cm)
Its length is : (20 + 10) : 2 = 15 (cm)
Its height is : \(15:\dfrac{3}{5}=25\) (cm)
Its area is : 15 x 25 = 375 (cm2)
