Question

Help................​

Answer 1

Answer:  DB is 5

Step-by-step explanation:

Alright, lets get started.

Since given that AD is parallel to CB.

And AB is parallel to CD.

And the angle A is given as 90°

It means the given figure is a rectangle.

And the diagonals of the rectangle are equal to each other.

So, $DB=AC$

So, $DB=5$

Hence the answer is 5 ...     Answer

Hope it will help :)