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Four times the side.
Each side of the rhombus will have a length of 105/4 = 26.25 dm
Unless it is a rhombus (or square) you cannot.
Assuming 7.5 cm is the length of one side. Then the perimeter of a rhombus is 4 x 7.5 cm = 30 cm Like a square the four sides of a Rhombus are of equal length. It just that the angles are NOT right angles. . Its a 'lazy square'.
Diags of rhombus form 4 Pythagorean triangles. If these triangles sides are 10 and 8 cm then hypotenuses would be 12.8 cm. Each hypotenuse is one side of the rhombus so perimeter would be 51.2 cm to nearest mm.