Can you help please thanks

Both angles are found using vertically opposite angles.
Let's review an example of vertically opposite angles to help you understand the concept of vertically opposite angles.
~Refer to image~
In this image, ∠2 and ∠4 must be equal because they are opposite to each other. If they are opposite to each other, they are an example of vertically opposite angles. The same is with ∠1 and ∠3.
Learn more about vertically opposite angles: