Jawaban:

To calculate the perimeter of parallelogram ABCD, we need to determine the lengths of the other sides. Since opposite sides of a parallelogram are equal in length, we can conclude that side AD is also 8 cm and side BC is 12 cm.

The perimeter of a parallelogram is the sum of all its sides. Therefore, the perimeter of parallelogram ABCD can be calculated as follows:

Perimeter = AB + BC + CD + DA

Since AB = 8 cm, BC = 12 cm, CD = 12 cm (because opposite sides of a parallelogram are equal), and DA = 8 cm, we can substitute these values into the formula:

Perimeter = 8 cm + 12 cm + 12 cm + 8 cm

Perimeter = 40 cm

Therefore, the perimeter of parallelogram ABCD is 40 cm.