1. **State the problem:** Find the perimeter of parallelogram ABCD where the sides are given as 6 m, 8 m, and 8 m. 2. **Recall the formula for the perimeter of a parallelogram:** $$\text{Perimeter} = 2(\text{length} + \text{width})$$ 3. **Identify the sides:** In a parallelogram, opposite sides are equal. Given sides are 6 m and 8 m (the repeated 8 m confirms the opposite side). 4. **Calculate the perimeter:** $$\text{Perimeter} = 2(6 + 8) = 2 \times 14 = 28$$ 5. **Conclusion:** The perimeter of parallelogram ABCD is 28 meters.