We have two similar figures that have the same shape but different measures.
We can compare the two figures by matching the corresponding sides.
In the following image we can see in the same color the first pair of corresponding sides:
That is because the orientation in the two figures is the same, so the corresponding sides are on the same side.
the answer to 1 is:
1. c DA
Because c is PM and DA and PM are corresponding sides.
We continue with the second side:
The answer to 2. is:
2. b AB
Because b is MN and AB and MN are corresponding sides.
We do the same for the remaining two sides, shown in blue and yellow:
For 3, we have that the corresponding side to DC is PO:
3. a DC
Because a is PO.
And for 4, the corresponding side to CB is ON, thus:
4. d CB
Answer:
1. c DA
2. b AB
3. a DC
4. d CB