Perimeter of a rhombus is calculated by adding the length of its sides together. Since all rhombus sides are equal in length, its perimeter can also be calculated by multiplying the length of a side by 4.
P = A + B + C + D
P = A × 4
Where P is the perimeter and A, B, C, and D are the sides of the rhombus.
If A = 5 units then P = ?
P = A × 4 = 5 × 4 = 20