Four times the side.
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60 units
Each side of the rhombus will have a length of 105/4 = 26.25 dm
All the sides of a rhombus are equal and perimeter of a rhombus is equal to four times the side. Perimeter = 4 x 17 units = 68 units
Perimeter = 4*Side so that Side = Perimeter/4 Area of a rhombus = Side * Altitude so Altitude = Area/Side = Area/(Perimeter/4) = 4*Area/Perimeter
16