One side of the parallelogram is 19 cm, and the other is 7 cm smaller. Find its perimeter.

If the second side is 7 cm less than the first side, then the second side of the parallelogram = 19 – 7 = 12 cm.
Since these sides are not equal, it means that they are adjacent (because opposite sides in a parallelogram are equal)
It follows that we can find the rest of the sides:
1 side = 3 side (opposite the first side) = 19 cm (because opposite sides in a parallelogram are equal)
2 side = 4 side (opposite to the second side) = 12 cm (because opposite sides in a parallelogram are equal)
To find the perimeter, add all the sides:
1 side + 2 side + 3 side + 4 side = perimeter
19 + 7 + 19 + 7 = 52 (cm) – parallelogram perimeter
Answer: 52 cm